Regulation No. 110-01

Name:Regulation No. 110-01
Description:Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) Vehicles.
Official Title:Uniform Provisions Concerning the Approval of: I. Specific Components of Motor Vehicles Using Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) in their Propulsion System; II. Vehicles with Regard to the Installation of Specific Components of an Approved Type for the Use of Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) in their Propulsion System.
Country:ECE - United Nations
Date of Issue:2013-08-19
Amendment Level:01 Series, Supplement 5
Number of Pages:214
Vehicle Types:Bus, Car, Component, Heavy Truck, Light Truck
Subject Categories:Prior Versions
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Keywords:

pressure, test, annex, lng, temperature, cylinder, valve, paragraph, type, gas, cng, material, requirements, approval, cylinders, working, design, accordance, maximum, tensile, iso, tests, fuel, tank, regulation, appendix, system, strength, service, relief, elongation, components, operating, natural, change, temperatures, minimum, manufacturer, hose, conditions, means, provisions, burst, mpa, vehicle, break, component, resistance, device, tested

Text Extract:

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E/ECE/324
) Rev 2/Add.109/Rev.3/Amend.5
E/ECE/TRANS/505 )
July 26, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 110-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
I. SPECIFIC COMPONENTS OF MOTOR VEHICLES USING COMPRESSED NATURAL
GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION
SYSTEM;
II.
VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC COMPONENTS
OF AN APPROVED TYPE FOR THE USE OF COMPRESSED NATURAL GAS (CNG)
AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION SYSTEM
Incorporating:
00 series of amendments
Date of Entry into Force: 28.12.00
Corr. 1 to the 00 series of amendments
Dated : 08.11.00
Corr. 2 to the 00 series of amendments
Dated: 27.06.01
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 31.01.03
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 27.02.04
Supplement 3 to the 00 series of amendments
Date of Entry into Force: 12.08.04
Supplement 4 to the 00 series of amendments
Date of Entry into Force: 04.07.06
Supplement 5 to the 00 series of amendments
Date of Entry into Force: 02.02.07
Supplement 6 to the 00 series of amendments
Date of Entry into Force: 18.06.07
Supplement 7 to the 00 series of amendments
Date of Entry into Force: 03.02.08
Supplement 8 to the 00 series of amendments
Date of Entry into Force: 22.07.09
Supplement 9 to the 00 series of amendments
Date of Entry into Force: 19.08.10
01 series of amendments
Date of Entry into Force: 15.07.13
Supplement 1 to the 01 series of amendments
Date of Entry into Force: 10.06.14
Supplement 2 to the 01 series of amendments
Date of Entry into Force: 09.10.14
Supplement 3 to the 01 series of amendments
Date of Entry into Force: 08.10.15
Supplement 4 to the 01 series of amendments
Date of Entry into Force: 18.06.16
Supplement 5 to the 01 series of amendments
Date of Entry into Force: 22.06.17

REGULATION No. 110-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
I. SPECIFIC COMPONENTS OF MOTOR VEHICLES USING COMPRESSED NATURAL
GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION SYSTEM;
II.
VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC COMPONENTS OF AN
APPROVED TYPE FOR THE USE OF COMPRESSED NATURAL GAS (CNG) AND/OR
LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION SYSTEM
CONTENTS
REGULATION
1.
Scope
2.
References
3.
Classification of Components
4.
Definitions
PART I – APPROVAL OF SPECIFIC COMPONENTS OF MOTOR VEHICLES USING COMPRESSED
NATURAL GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR
PROPULSION SYSTEM
5
Application for Approval
6.
Markings
7.
Approval
8.
Specifications Regarding CNG and/or LNG Components
9.
Modifications of a Type of CNG and/or LNG Component and Extension of Approval
10.
(Not allocated)
11.
Conformity of Production
12.
Penalties for Non-conformity of Production
13.
(Not allocated)
14.
Production Definitively Discontinued
15.
Names and Addresses of Technical Services Responsible For Conducting Approval Tests, and of
Type Approval Authorities
PART II – APPROVAL OF VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC
COMPONENTS OF AN APPROVED TYPE FOR THE USE OF COMPRESSED NATURAL
GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN THEIR PROPULSION
SYSTEM
16.
Application for Approval
17.
Approval
18.
Requirements for the Installation of Specific Components for the Use of Compressed Natural Gas
and/or Liquefied Natural Gas in the Propulsion System of a Vehicle
19.
Conformity of Production
20.
Penalties for Non-conformity of Production
21.
Modification and Extension of Approval of a Vehicle Type
22.
Production Definitively Discontinued
23.
Names and Addresses of Technical Services Responsible for Conducting Approval Tests, and of
Type Approval Authorities
24.
Transitional Provisions

Annex 5 – Test Procedures
Annex 5A – Overpressure Test (Strength Test)
Annex 5B – External Leakage Test
Annex 5C – Internal Leakage Test
Annex 5D – CNG/LNG Compatibility Test
Annex 5E – Corrosion Resistance Test
Annex 5F – Resistance to Dry Heat
Annex 5G – Ozone Ageing
Annex 5H – Temperature Cycle Test
Annex 5I – Pressure Cycle Test Applicable Only to Cylinders
Annex 5J – (Not Allocated)
Annex 5K – (Not Allocated)
Annex 5L – Durability Test (Continued Operation)
Annex 5M – Burst/Destructive Test Applicable Only to CNG Cylinders
Annex 5N – Vibration Resistance Test
Annex 5O – Operating Temperatures
Annex 5P – LNG – Low Temperature Test
Annex 5Q – Compatibility with Heat Exchange Fluids of Non-Metallic Parts
Annex 6 – Provisions on CNG Identification Mark for Vehicles of Categories M and M , N and N
Annex 7 – Provisions on LNG Identification Mark for Vehicles of Categories M and M , N and N

ASTM E647-93
ASTM E813-89
ASTM G53-93
Standard Test Method for Measurement of Fatigue Crack Growth
Rates;
Test Method for J , a Measure of Fracture Toughness;
Standard Practice for Operating Light and Water - Exposure
Apparatus (Fluorescent UV-Condensation Type) for Exposure of
non-metallic materials
BSI Standards
BS 5045:
BS 7448-91
Part 1 (1982) Transportable Gas Containers - Specification for
Seamless Steel Gas Containers Above 0.5l Water Capacity
Fracture Mechanics Toughness Tests Part I - Method for
Determination of K , Critical COD and Critical J Values of BS PD
6493-1991. Guidance and Methods for Assessing the A
Acceptability of Flaws in Fusion Welded Structures; Metallic
Materials
EN Standards
EN 13322-2-2003
EN ISO 5817-2003
EN1251-2 2000
EN 895:1995
EN 910:1996
EN 1435:1997
EN 6892-1:2009
Transportable gas cylinders − Refillable welded steel gas
cylinders − Design and construction − Part 2: Stainless steel
Arc-welded joints in steel; guidance on quality levels for
imperfections.
Cryogenic vessels. Vacuum insulated vessels of not more than
1,000 litres volume
Destructive tests on welds in metallic materials. Transverse tensile
test
Destructive test methods on welds in metallic materials. Bend
tests
Non-destructive examination of welds. Radiographic examination
of welded joints
Metallic materials. Tensile test
EN 10045-1:1990 Charpy impact test on metallic materials. Test method (V- and U-
notches)

ISO 6508-1986
ISO 7225
ISO/DIS 7866-1992
ISO 9001:1994
ISO 9002:1994
ISO/DIS 12737
ISO12991
ISO14469-1:2004
ISO14469-2:2007
ISO15500
ISO 21028-1:2004
ISO 21029-1:2004
Metallic Materials – Hardness Tests – Rockwell Test (Scales,
ABCDEFGHK)
Precautionary Labels for Gas Cylinders
Refillable Transportable Seamless Aluminium Alloy Cylinders for
Worldwide Usage Design, Manufacture and Acceptance
Quality Assurance in Design/Development. Production, Installation
and Servicing
Quality Assurance in Production and Installation
Metallic Materials – Determination of the Plane-Strain Fracture
Toughness
Liquefied natural gas (LNG) – transportable tanks for use on board
of vehicles
Road Vehicles: compressed natural gas CNG refuelling connector:
Part I: 20MPa (200bar) connector
Road Vehicles: compressed natural gas CNG refuelling connector:
Part II: 20MPa (200bar) connector
Road vehicles – Compressed natural gas (CNG) fuel system
components
Cryogenic vessels – Toughness requirements for materials at
cryogenic temperature – Part I: Temperatures below -80°C
Cryogenic vessels – Transportable vacuum insulated vessels of
not more than 1,000 litres volume – Part I: Design, fabrication,
inspection and tests
ISO/IEC Guide 25-1990 General requirements for the Technical Competence of Testing
Laboratories
ISO/IEC Guide 48-1986 Guidelines for Third Party Assessment and Registration of
Supplies Quality System
ISO/DIS 9809 Transportable Seamless Steel Gas Cylinders Design,
Construction and Testing – Part I: Quenched and Tempered Steel
Cylinders with Tensile Strength <1,100MPa
ISO 11439
Gas cylinders – High pressure cylinders for the on-board storage
of natural gas as a fuel for automotive vehicles

Figure 1-1
Flow Scheme for CNG and/or LNG Components Classification

4.5. "Operating temperatures" means maximum values of the temperature ranges, indicated in
Annex 5O, at which safe and good functioning of the specific component is ensured and for
which it has been designed and approved.
4.6. "Specific components" means:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
(m)
(n)
(o)
(p)
(q)
(r)
(s)
(t)
(u)
(v)
(w)
(x)
(y)
(z)
Container (cylinder or tank);
Accessories fitted to the container;
Pressure regulator;
Automatic valve;
Manual Valve;
Gas supply device;
Gas flow adjuster;
Flexible fuel line;
Rigid fuel line;
Filling unit or receptacle;
Non-return valve or check valve;
Pressure relief valve (discharge valve) primary and secondary;
Pressure Relief device (temperature triggered);
Filter;
Pressure or temperature sensor/indicator;
Excess flow valve;
Service valve;
Electronic control unit;
Gas-tight housing;
Fitting;
Ventilation hose;
Pressure relief device (PRD) (pressure triggered);
Fuel rail.
Heat exchanger/vaporizer;
Natural gas detector;
Fuel pump (for LNG)

4.16. "Accessories fitted to the container or tank" means the following components (but not
limited to them), either separate or combined, when fitted to the container or tank:
4.16.1 "Manual valve" means a valve which is operated manually.
4.16.2. "Pressure sensor/indicator" means a pressurised device which indicates the gas or liquid
pressure.
4.16.3. "Excess flow valve" means valve which automatically shuts off or limits, the gas flow when
the flow exceeds a set design value.
4.16.4. "Gas-tight housing" means a device that vents gas leakage to outside the vehicle including
the gas ventilation hose.
4.17. "Valve" means a device by which the flow of a fluid may be controlled.
4.18. "Automatic valve" means a valve that is not operated manually.
4.19. "Automatic cylinder valve" means an automatic valve rigidly fixed to the cylinder that
controls the flow of gas to the fuel system. The automatic cylinder valve is also called
remote-controlled service valve.
4.20. "Non-return valve or check valve" means an automatic valve that allows gas to flow in
only one direction.
4.21 "Excess flow valve" (excess flow limiting device) means a device that automatically shuts
off, or limits, the gas flow or liquid flow when the flow exceeds a set design value.
4.22. "Manual valve" means a manual valve rigidly fixed to the cylinder or tank.
4.23. "Pressure relief valve (discharge valve)" means a device that prevents a pre-determined
upstream pressure being exceeded.
4.24 "Service valve" means an isolation valve that is closed only when servicing the vehicle.
4.25. "Filter" means a protective screen that removes foreign debris from the gas or liquid
stream.
4.26. "Fitting" means a connector used in a piping, tubing, or hose system.
4.27. "LNG fuel pump" means a device to establish the supply of LNG to the engine by
increasing the pressure of the fluid (liquid or vapour).
4.28 "Flexible fuel lines" mean a flexible tubing or hose through which natural gas flows.
4.29. "Rigid fuel lines" mean a tubing that has not been designed to flex in normal operation and
through which natural gas flows.
4.30. "Gas supply device" means a device for introducing gaseous fuel into the engine intake
manifold (carburettor or injector).
4.31. "Gas/air mixer" means a device for mixing the gaseous fuel and intake air for the engine.

4.48. "Auto-frettage pressure" means the pressure within the over-wrapped cylinder at which
the required distribution of stresses between the liner and the over-wrap is established.
4.49. "Batch - composite cylinders" means a "batch" i.e. a group of cylinders successively
produced from qualified liners having the same size, design, specified materials of
construction and process of manufacture.
4.50. "Batch - metal cylinders and liners" means a "batch" i.e. a group of metal cylinders or
liners successively produced having the same nominal diameter, wall thickness, design,
specified material of construction, process of manufacture, equipment for manufacture and
heat treatment, and conditions of time, temperature and atmosphere during heat treatment.
4.51. "Batch non-metallic liners" means a "batch" i.e. a group of non-metallic liners
successively produced having the same nominal diameter, wall thickness, design specified
material of construction and process of manufacture.
4.52. "Batch limits" means in no case a "batch" shall be permitted to exceed 200 finished
cylinders or liners (not including destructive test cylinders or liners), or one shift of
successive production, whichever is greater.
4.53. "Composite cylinder" means a cylinder made of resin impregnated continuous filament
wound over a metallic or non-metallic liner. Composite cylinders using non-metallic liners
are referred to as all-composite cylinders.
4.54. "Controlled tension winding" means a process used in manufacturing hoop wrapped
composite cylinders with metal liners by which compressive stresses in the liner and tensile
stresses in the over-wrap at zero internal pressure are obtained by winding the reinforcing
filaments under significant high tension.
4.55. "Filling pressure" means the gas pressure in the cylinder immediately upon completion of
filling.
4.56. "Finished cylinders" means completed cylinders that are ready for use, typical of normal
production, complete with identification marks and external coating including integral
insulation specified by the manufacturer, but free from non-integral insulation or protection.
4.57. "Full-wrap" means an over-wrap having a filament wound reinforcement both in the
circumferential and axial direction of the cylinder.
4.58. "Gas temperature" means the temperature of gas in a cylinder.
4.59. "Hoop-wrap" means an over-wrap having a filament wound reinforcement in a substantially
circumferential pattern over the cylindrical portion of the liner so that the filament does not
carry any significant load in a direction parallel to the cylinder longitudinal axis.
4.60. "Liner" means a container that is used as a gas-tight, inner shell, on which reinforcing
fibres are filament wound to reach the necessary strength. Two types of liners are described
in this standard: Metallic liners that are designed to share the load with the reinforcement,
and non-metallic liners that do not carry any part of the load.
4.61. "Manufacturer" means the person or organization responsible for the design, fabrication
and testing of CNG or LNG specific components.

PART I
APPROVAL OF SPECIFIC COMPONENTS OF MOTOR VEHICLES USING
COMPRESSED NATURAL GAS (CNG) AND/OR LIQUEFIED NATURAL
GAS (LNG) IN THEIR PROPULSION SYSTEM
5. APPLICATION FOR APPROVAL
5.1. The application for approval of specific component or multifunctional component shall be
submitted by the holder of the trade name or mark or by his duly accredited representative.
5.2. It shall be accompanied by the under-mentioned documents in triplicate and by the following
particulars:
5.2.1. Description of the vehicle comprising all the relevant particulars referred to in Annex 1A to
this Regulation,
5.2.2. A detailed description of the type of the specific component or multifunctional components;
5.2.3. A drawing of the specific component or multifunctional components, sufficiently detailed and
on an appropriate scale;
5.2.4. Verification of compliance with the specifications prescribed in Paragraph 8. of this
Regulation.
5.3. At the request of the Technical Service responsible for conducting approval tests, samples
of the specific component or multifunctional components shall be provided. Supplementary
samples shall be supplied upon request (3 maximum)
5.3.1. During pre-production of containers [n] , containers of each 50 pieces (lot of qualification)
shall be subject to non-destructive tests of Annex 3A. For LNG tanks see Annex 3B.
6 MARKINGS
6.1. The sample of specific component or multifunctional components submitted for approval
shall bear the trade name or mark of the manufacturer and the type, including one
concerning designation regarding operating temperatures ("M" or "C" for moderate or cold
temperatures "L" for LNG as appropriate); and for flexible hoses also the manufacturing
month and year; this marking shall be clearly legible and indelible.
6.1.1. In addition to provisions of Paragraph 6.1., one of the following additional marks shall be
used for automatic cylinder valve which comply with Paragraph 2.2.4. of Annex 4A:
(a)
(b)
(c)
"H1"
"H2"
"H3"
6.2. All components shall have a space large enough to accommodate the approval mark; this
space shall be shown on the drawings referred to in Paragraph 5.2.3. above.

7.2. An approval number shall be assigned to each type of component or multifunctional
component approved. Its first two digits (at present 01 corresponding to the 01 series of
amendments) shall indicate the series of amendments incorporating the most recent major
technical amendments made to the Regulation at the time of issue of the approval. The
same Contracting Party shall not assign the same alphanumeric code to another type of
component.
7.3. Notice of approval or of refusal or of extension of approval of a CNG or LNG component
type pursuant to this Regulation shall be communicated to the Parties to the Agreement
applying this Regulation, by means of a form conforming to the model in Annex 2B to this
Regulation.
7.4. There shall be affixed, conspicuously and in the space referred to in Paragraph 6.2. above,
to all components conforming to a type-approved under this Regulation, in addition to the
mark prescribed in Paragraphs 6.1. and 6.3. (CNG) and 6.4 (LNG), an international approval
mark consisting of:
7.4.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval .
7.4.2.. The number of this Regulation, followed by the Letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 7.4.1. above. This approval number
consists of the component type-approval number which appears on the certificate
completed for this type (see Paragraph 7.2. above. and Annex 2B) preceded by two figures
indicating the sequence of the latest series of amendments to this Regulation.
7.5. The approval mark shall be clearly legible and be indelible.
7.6. Annex 2A to this Regulation gives examples of the arrangement of the aforesaid approval
mark.
8 SPECIFICATIONS ON CNG AND LNG COMPONENTS
8.1. General Provisions
8.1.1. The specific components of vehicles using CNG and/or LNG in their propulsion system shall
function in a correct and safe way as specified in this Regulation.
The materials of the components that are in contact with CNG/LNG shall be compatible with
it (see Annex 5D).
Those parts of component whose correct and safe functioning is liable to be influenced by
CNG/LNG, high pressure or vibrations has to be submitted to relevant test procedures
described in the annexes to this Regulation. In particular the provisions of Paragraphs 8.2.
to 8.11. are to be fulfilled for CNG components. For LNG components, the provisions of
Paragraphs 8.12. to 8.21. shall be fulfilled.
The specific components of vehicles using CNG/LNG in their propulsion system shall
comply with relevant electromagnetic compatibility (EMC) requirements according to
Regulation No. 10, 03 series of amendments, or equivalent.

8.13. Provisions on Components Fitted to the LNG Tank
8.13.1. The LNG tank shall be equipped at least with the following components, which may be
either separate or combined (special care shall be taken to prevent LNG trapping):
8.13.1.1. Pressure relief valve;
8.13.1.2. Manual valve;
8.13.1.3. Automatic valve;
8.13.1.4. Excess flow device.
8.13.2. The tank may be equipped with a gas-tight housing, if necessary.
8.13.3. The components mentioned in Paragraphs 8.13.1.1. to 8.13.1.4. above shall be type
approved pursuant to the provisions laid down in Annex 4 to this Regulation.
8.14.-8.22. Provisions Regarding Other LNG Components
The components shown shall be type approved pursuant to the provisions laid down in the
annexes which can be determined from the table below:
Paragraph Component Annex
8.15. LNG heat exchanger – vaporizer 4I
8.16. LNG filling receptacle 4J
8.17. Pressure control regulator 4K
8.18. LNG Pressure and/or temperature sensor/indicator 4L
8.19. Natural gas detector 4M
8.20.
Automatic valve, check valve, the pressure relief valve,
excess flow valve, manual valve and non-return valve.
8.21. Fuel pump 4O
8.22. Electronic control unit 4H
4N
9. MODIFICATIONS OF A TYPE OF CNG AND/OR LNG COMPONENT AND EXTENSION
OF APPROVAL
9.1. Every modification of a type of CNG and/or LNG component shall be notified to the Type
Approval Authority that granted the type-approval. The Type Approval Authority may then
either:
9.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect,
and that the component still complies with the requirements; or
9.1.2. Determine whether partial or complete retesting has to be established by the Type Approval
Authority.

PART II
APPROVAL OF VEHICLES WITH REGARD TO THE INSTALLATION OF SPECIFIC
COMPONENTS OF AN APPROVED TYPE FOR THE USE OF COMPRESSED
NATURAL GAS (CNG) AND/OR LIQUEFIED NATURAL GAS (LNG) IN
THEIR PROPULSION SYSTEM
16. APPLICATION FOR APPROVAL
16.1. The application for approval of a vehicle type with regard to the installation of specific
components for the use of compressed natural gas (CNG) and/or liquefied natural gas
(LNG) in its propulsion system shall be submitted by the vehicle manufacturer or by his duly
accredited representative.
16.2. It shall be accompanied by the under-mentioned documents in triplicate: description of the
vehicle comprising all the relevant particulars referred to in Annex 1B to this Regulation.
16.3. A vehicle representative of the vehicle type to be approved, shall be submitted to the
Technical Service conducting the approval tests.
17. APPROVAL
17.1. If the vehicle submitted for approval pursuant to this Regulation is equipped with all the
necessary specific components for the use of compressed natural gas (CNG) and/or
liquefied natural gas (LNG) in its propulsion system and meets the requirements of
Paragraph 18. below, approval of that vehicle type shall be granted.
17.2. An approval number shall be assigned to each type of vehicle approved. Its first two digits
shall indicate the series of amendments incorporating the most recent major technical
amendments made to the Regulation at the time of issue of the approval.
17.3. Notice of approval or of refusal or of extension of approval of a CNG and/or LNG vehicle
type pursuant to this Regulation shall be communicated to the Parties to the Agreement
applying this Regulation, by means of a form conforming to the model in Annex 2D to this
Regulation.
17.4. There shall be affixed, conspicuously and in a readily accessible space specified on the
approval form referred to in Paragraph 17.2. above, to every vehicle type-approved under
this Regulation an international approval mark consisting of:
17.4.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval ;
17.4.2. The number of this Regulation, followed by the Letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 17.4.1.

18.1.7.2. The heating system referred to in Paragraph 18.1.7.1. shall be permitted if, in the view of the
Technical Services responsible for conducting type-approval, the heating system is
adequately protected and the required operation of the normal CNG and/or LNG system is
not affected.
18.1.8. Identification of CNG-and/or LNG Fuelled Vehicles
18.1.8.1. Vehicles of Categories M and M equipped with a CNG system shall be labelled as
specified in Annex 6.
18.1.8.2. Vehicles of Categories M and M equipped with a LNG system shall be labelled as
specified in Annex 7.
18.1.8.3. The label shall be installed on the front and rear of the vehicle of Category M or M and on
the outside of the doors on the right-hand side. (left hand drive vehicles), left-hand side
(right hand drive vehicles).
18.1.8.4. A label shall be placed adjacent to the LNG fill receptacle stating the fuelling requirements.
The fuelling requirements shall be as recommended by the manufacturer.
18.2. Further Requirements
18.2.1. No component of the CNG and/or LNG system, including any protective materials which
form part of such components, shall project beyond the outline of the vehicle, with the
exception of the filling unit if this does not project more than 10mm beyond its point of
attachment.
18.2.2. Proper shielding against heat of adjacent components shall be considered and no
component of the CNG and/or LNG system shall be located within 100mm of the exhaust or
similar heat source, unless such components are adequately shielded against heat.
18.3. The CNG System
18.3.1. A CNG system shall contain at least the following components:
18.3.1.1. Container(s) or cylinder(s);
18.3.1.2. Pressure indicator or fuel level indicator;
18.3.1.3. Pressure relief device (temperature triggered);
18.3.1.4. Automatic cylinder valve;
18.3.1.5. Manual valve;
18.3.1.6. Pressure regulator;
18.3.1.7. Gas flow adjuster;
18.3.1.8. Excess flow limiting device;
18.3.1.9. Gas supply device;

18.3.4.11. LNG check valve or non-return valve;
18.3.4.12. LNG pressure indicator or fuel indicator;
18.3.4.13. Electronic control unit;
18.3.4.14. Natural gas detector or gas tight housing, for category M vehicles.
18.3.5. The LNG system may also include the following components:
18.3.5.1. LNG pressure regulator;
18.3.5.2. LNG pressure and/or temperature sensor;
18.3.5.3. LNG fuel pump;
18.3.5.4. LNG level gauge;
18.3.5.5. Natural gas detector;
18.3.5.6. Gas tight housing.
18.3.6. LNG vehicles components downstream of the heat exchanger/vaporizer (gaseous phase)
shall be considered as CNG components.
18.4. Installation of the Container and/or Tanks
18.4.1. The container and/or tank shall be permanently installed in the vehicle and shall not be
installed in the engine compartment.
18.4.2. The container and/or tank shall be installed such that there is no metal to metal contact, with
the exception of the fixing points of the container(s) and/or tank(s)
18.4.3. When the vehicle is ready for use the fuel container and/or tank shall not be less than
200mm above the road surface.
18.4.3.1. The provisions of Paragraph 18.4.3. shall not apply if the container and/or tank is
adequately protected, at the front and the sides and no part of the container is located lower
than this protective structure.

18.5.3.1. The excess flow limiting device shall be fitted in the CNG fuel container(s) on the automatic
cylinder valve.
18.5.4. Manual Valve
18.5.4.1. A manual valve is rigidly fixed to the CNG cylinder which can be integrated into the
automatic cylinder valve.

18.6.3. Pressure Relief Valve (Primary)
The primary pressure relief valve outlet shall be connected to an open ended pipe-away
system to move vented gas away to a high level. Consideration shall be given to preventing
any blockage or freezing of the pipe-away. The LNG primary relief valve shall not vent into
the gas tight housing (if fitted).
18.6.4. Pressure Relief Valve (Secondary)
The secondary relief valve may relieve gas immediately from its outlet. Protection from
water ingress and damage shall be considered. The secondary relief valve outlet shall not
be connected to the same pipe-away as the primary relief valve. The LNG secondary relief
valve shall not vent into the gas tight housing (if fitted).
18.6.5. Manual Fuel Shut Off Valve
The manual fuel shut off valve shall be mounted directly on the LNG tank (in a protected
position). It should be readily accessible. The manual fuel shut off valve can be integrated
into the automatic valve.
18.6.6. Manual Vapour Shut Off Valve
The manual vapour shut off valve shall be mounted directly on the LNG tank (in a protected
position). It should be readily accessible.
18.6.7. Vent Line or Connector
The vent line or connector may be mounted inside or on the LNG tank (in a protected
position). It should be readily accessible. The vent connector shall be suitable for the
purpose at temperatures indicated in Annex 5O for the working pressure of the LNG tank.
18.6.8. Venting Management System
The primary pressure relief valve shall be piped to a vent stack which extends to a high
level. The primary and secondary relief valve outlets shall be protected from fouling by dirt,
debris, snow, ice and/or water. The vent stack shall be sized to prevent flow restriction due
to pressure drop. Gas exiting the vent stack or secondary relieve valve shall not impinge on
enclosed areas, other vehicles, exterior-mounted systems with air intake (i.e. airconditioning
systems), engine intakes, or engine exhaust. In the case of dual tanks, the
primary relief valve outlets piping for each tank may be manifold to a common stack.
18.7. Rigid and Flexible Fuel Lines
18.6.1. CNG rigid fuel lines shall be made of seamless material: either stainless steel or steel with
corrosion-resistant coating.
18.7.1.1. LNG rigid fuel lines shall be made of austenitic stainless steel or copper, either seamless or
welded.
18.7.2. The CNG rigid fuel line may be replaced by a flexible fuel line if used in Class 0, 1, 2 or 6.
18.7.2.1. The LNG rigid fuel line may be replaced by a flexible fuel line if used in Class 5.

18.10. Filling Unit or Receptacle
18.10.1. The filling unit shall be secured against rotation and shall be protected against dirt and
water.
18.10.2. When the CNG/LNG container or tank is installed in the passenger compartment or an
enclosed (luggage) compartment the filling unit shall be located at the outside of the vehicle
or in engine compartment.
18.10.3. For vehicles of Classes M and N the CNG filling unit (receptacle) shall comply with the
drawing specifications detailed in Figure 1 of Annex 4F.
18.10.4. For vehicles of Categories M , M , N and N , the CNG filling unit (receptacle) shall comply
with the drawing specifications detailed in Figure 1 or Figure 2 of Annex 4F or with the
drawing specifications detailed in Figure 1 of Annex 4F for CNG only.
18.11. Fuel Selection System and Electrical Installation
18.11.1. The electrical components of the CNG/LNG system shall be protected against overloads.
18.11.2. Vehicles with more than one fuel system shall have a fuel selection system which shall
prevent both a flow of gaseous fuel into the petrol or diesel tank and a flow of petrol or
diesel into the gaseous fuel tank, even in the case of a fault of the fuel selection system.
18.11.3. The measures shall be demonstrated during the type approval.
18.11.4. The electrical connections and components in the gas-tight housing shall be constructed
such that no sparks are generated.
18.12. The LNG system shall be designed to prevent any LNG trapping.
18.13. The LNG system in category M vehicles shall be equipped with a natural gas detector
and/or gas tight housing. The LNG system in category N vehicles may be equipped with a
natural gas detector if the fuel storage tank and associated piping is mounted on the exterior
of the vehicle without the possibility of gas trapping (as in Paragraph 18.12.). If the fuel
storage tank is located inside the cargo area of a category N vehicle then a natural gas
detector and/or gas tight housing is mandatory.
19. CONFORMITY OF PRODUCTION
19.1. The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2).
20. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
20.1. The approval granted in respect of a type of vehicle pursuant to this Regulation may be
withdrawn if the requirements referred to in Paragraph 18 above are not complied with.
20.2. If a Party to the Agreement applying this Regulation withdraws an approval it has previously
granted, it shall forthwith so notify the other Contracting Parties applying this Regulation, by
means of a communication form conforming to the model in Annex 2D to this Regulation.

24.4. As from 18 months after the date of entry into force of the 01 series of amendments to this
Regulation, Contracting Parties applying this Regulation shall grant approvals only if the
vehicle type to be approved meets the requirements of Part II of this Regulation as
amended by the 01 series of amendments to this Regulation.
24.5. Until 12 months after the date of entry into force of the 01 series of amendments to this
Regulation, Contracting Parties applying this Regulation can continue to grant type
approvals for the type of components to the original version of this Regulation without taking
into account the provisions of the 01 series of amendments.
24.6. Until 18 months after the date of entry into force of the 01 series of amendments to this
Regulation, Contracting Parties applying this Regulation can continue to grant type
approvals for the vehicle type to the original version of this Regulation without taking into
account the provisions of the 01 series of amendments.
24.7. Notwithstanding the provisions of Paragraphs 24.5. and 24.6. above, Contracting Parties
applying this Regulation shall not refuse to grant extensions of type approvals for existing
types of component or vehicle types which have been issued according to this Regulation
without taking into account the provisions of the 01 series of amendments to this Regulation.

1.2.4.5.4.
CNG Gas flow adjuster: yes/no
1.2.4.5.4.1.
Number: ...........................................................................................................................
1.2.4.5.4.2.
Make(s): ...........................................................................................................................
1.2.4.5.4.3.
Type(s): ............................................................................................................................
1.2.4.5.4.4.
Drawings: .........................................................................................................................
1.2.4.5.4.5.
Adjustment possibilities (description) ..............................................................................
1.2.4.5.4.6.
Working pressure(s):
.............................................................................................. kPa
1.2.4.5.4.7.
Material: ...........................................................................................................................
1.2.4.5.4.8.
Operating temperatures:
.......................................................................................... °C
1.2.4.5.5.
CNG Gas injector(s): yes/no
1.2.4.5.5.1.
Make(s): ...........................................................................................................................
1.2.4.5.5.2.
Type(s): ............................................................................................................................
1.2.4.5.5.3.
Identification: ....................................................................................................................
1.2.4.5.5.4.
Working pressure(s):
............................................................................................... kPa
1.2.4.5.5.5.
Drawings of installation: ...................................................................................................
1.2.4.5.5.6.
Material: ...........................................................................................................................
1.2.4.5.5.7.
Operating temperatures:
.......................................................................................... °C
1.2.4.5.6.
Electronic Control Unit (CNG and/or LNG): yes/no
1.2.4.5.6.1.
Make(s): ...........................................................................................................................
1.2.4.5.6.2.
Type(s): ............................................................................................................................
1.2.4.5.6.3.
Adjustment possibilities: ..................................................................................................
1.2.4.5.6.4.
Basic software principles: ................................................................................................
1.2.4.5.6.5.
Operating temperatures:
.......................................................................................... °C

1.2.4.5.8.3.3.
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.3.4.
Material: ................................................................................................................................
1.2.4.5.8.3.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.4.
Excess flow valve: yes/no
1.2.4.5.8.4.1
Make(s): ................................................................................................................................
1.2.4.5.8.4.2
Type(s): .................................................................................................................................
1.2.4.5.8.4.3
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.4.4.
Material: ................................................................................................................................
1.2.4.5.8.4.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.5.
Gas-tight housing: yes/no
1.2.4.5.8.5.1
Make(s): ................................................................................................................................
1.2.4.5.8.5.2
Type(s): .................................................................................................................................
1.2.4.5.8.5.3
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.5.4.
Material: ................................................................................................................................
1.2.4.5.8.5.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.6.
Manual valve: yes/no
1.2.4.5.8.6.1
Make(s): ................................................................................................................................
1.2.4.5.8.6.2
Type(s): .................................................................................................................................
1.2.4.5.8.6.3
Drawings: ..............................................................................................................................
1.2.4.5.8.6.4
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.6.5.
Material: ................................................................................................................................
1.2.4.5.8.6.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.9.
Pressure relief device (temperature triggered): yes/ no
1.2.4.5.9.1.
Make(s): ................................................................................................................................
1.2.4.5.9.2.
Type(s): .................................................................................................................................

1.2.4.5.13.
CNG filter(s): yes/no
1.2.4.5.13.1.
Make(s): ................................................................................................................................
1.2.4.5.13.2.
Type(s): .................................................................................................................................
1.2.4.5.13.3.
Description: ...........................................................................................................................
1.2.4.5.13.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.13.5.
Material: ................................................................................................................................
1.2.4.5.13.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.14.
Non-return valve(s) or check valve(s): yes/no
1.2.4.5.14.1.
Make(s): ................................................................................................................................
1.2.4.5.14.2.
Type(s): .................................................................................................................................
1.2.4.5.14.3.
Description: ...........................................................................................................................
1.2.4.5.14.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.14.5.
Material: ................................................................................................................................
1.2.4.5.14.6.
Operating temperatures:
............................................................................................... °C
1.2.4.5.15.
Connection to CNG/LNG system for heating system : yes/no
1.2.4.5.15.1.
Make(s): ................................................................................................................................
1.2.4.5.15.2.
Type(s): .................................................................................................................................
1.2.4.5.15.3.
Description and drawings of installation:
1.2.4.5.16.
PRD (pressure triggered): yes/no
1.2.4.5.16.1.
Make(s): ...............................................................................................................................
1.2.4.5.16.2.
Type(s): ................................................................................................................................
1.2.4.5.16.3.
Description and drawings: ...................................................................................................
1.2.4.5.16.4.
Activation pressure:
................................................................................................... MPa
1.2.4.5.16.5.
Material: ...............................................................................................................................
1.2.4.5.16.6.
Operating temperatures:
............................................................................................... °C

1.2.4.5.20.5.
Material: .................................................................................................................................
1.2.4.5.21.
LNG pressure control regulator(s): yes/no
1.2.4.5.21.1.
Make(s): .................................................................................................................................
1.2.4.5.21.2.
Type(s): ..................................................................................................................................
1.2.4.5.21.3.
Description: ............................................................................................................................
1.2.4.5.21.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.21.5.
Material: .................................................................................................................................
1.2.4.5.22.
LNG Pressure and/or temperature sensor(s): yes/no
1.2.4.5.22.1.
Make(s): .................................................................................................................................
1.2.4.5.22.2.
Type(s): ..................................................................................................................................
1.2.4.5.22.3.
Description: ............................................................................................................................
1.2.4.5.22.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.22.5.
Material: .................................................................................................................................
1.2.4.5.23.
LNG manual valve(s): yes/no
1.2.4.5.23.1.
Make(s): .................................................................................................................................
1.2.4.5.23.2.
Type(s): ..................................................................................................................................
1.2.4.5.23.3.
Description: ............................................................................................................................
1.2.4.5.23.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.23.5.
Material: .................................................................................................................................
1.2.4.5.24.
LNG Automatic valve(s): yes/no
1.2.4.5.24.1.
Make(s): .................................................................................................................................
1.2.4.5.24.2.
Type(s): ..................................................................................................................................
1.2.4.5.24.3.
Description: ............................................................................................................................
1.2.4.5.24.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.24.5.
Material: .................................................................................................................................

ANNEX 1B
ESSENTIAL CHARACTERISTICS OF THE VEHICLE, ENGINE AND CNG/LNG-RELATED SYSTEM
0. DESCRIPTION OF THE VEHICLE(S)
0.1. Make: ....................................................................................................................................
0.2. Type(s): .................................................................................................................................
0.3. Name and address of the manufacturer: ..............................................................................
0.4. Engine type(s) and approval No.(Nos.): ...............................................................................
1. DESCRIPTION OF THE ENGINE(S)
1.1. Manufacturer: ........................................................................................................................
1.1.1. Manufacturer's engine code(s) (as marked on the engine, or other means of identification):
..............................................................................................................................................
1.2. Internal Combustion Engine
1.2.3 (Not allocated)
1.2.4.5.1. (Not allocated)
1.2.4.5.2. Pressure regulator(s):
1.2.4.5.2.1. Make(s): ................................................................................................................................
1.2.4.5.2.2. Type(s): .................................................................................................................................
1.2.4.5.2.3. Working pressure(s): ................................................................................................... kPa
1.2.4.5.2.4. Material: ................................................................................................................................
1.2.4.5.2.5. Operating temperatures: ............................................................................................... °C
1.2.4.5.3. Gas/air mixer: yes/ no
1.2.4.5.3.1. Number: ................................................................................................................................
1.2.4.5.3.2. Make(s): ................................................................................................................................
1.2.4.5.3.3. Type(s): .................................................................................................................................
1.2.4.5.3.4. Working pressure(s): ................................................................................................... kPa

1.2.4.5.7.5.
Dimensions: ..........................................................................................................................
1.2.4.5.7.6.
Material: ................................................................................................................................
1.2.4.5.8.
CNG container accessories/LNG tank accessories:
1.2.4.5.8.1.
Pressure indicator:
1.2.4.5.8.1.1.
Make(s) .................................................................................................................................
1.2.4.5.8.1.2.
Type(s): .................................................................................................................................
1.2.4.5.8.1.3.
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.1.4.
Material: ................................................................................................................................
1.2.4.5.8.1.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.2.
Pressure relief valve (discharge valve): yes/no
1.2.4.5.8.2.1
Make(s): ................................................................................................................................
1.2.4.5.8.2.2
Type(s): .................................................................................................................................
1.2.4.5.8.2.3
Working pressure
:....................................................................................................... MPa
1.2.4.5.8.2.4.
Material: ................................................................................................................................
1.2.4.5.8.2.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.3.
Automatic valve(s):
1.2.4.5.8.3.1.
Make(s): ................................................................................................................................
1.2.4.5.8.3.2.
Type(s): .................................................................................................................................
1.2.4.5.8.3.3.
Working pressure(s)
:................................................................................................... MPa
1.2.4.5.8.3.4.
Material: ................................................................................................................................
1.2.4.5.8.3.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.8.4.
Excess flow valve: yes/no
1.2.4.5.8.4.1.
Make(s): ................................................................................................................................
1.2.4.5.8.4.2.
Type(s): .................................................................................................................................
1.2.4.5.8.4.3.
Working pressure(s)
:................................................................................................... MPa

1.2.4.5.10.4.
Material: ................................................................................................................................
1.2.4.5.10.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.11.
Flexible fuel lines: yes/no
1.2.4.5.11.1.
Make(s): ................................................................................................................................
1.2.4.5.11.2.
Type(s): .................................................................................................................................
1.2.4.5.11.3.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.11.4.
Material: ................................................................................................................................
1.2.4.5.11.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.12.
Pressure and temperature sensor(s): yes/no
1.2.4.5.12.1.
Make(s): ................................................................................................................................
1.2.4.5.12.2.
Type(s): .................................................................................................................................
1.2.4.5.12.3.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.12.4.
Material: ...............................................................................................................................
1.2.4.5.12.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.13.
CNG filter: yes/ no
1.2.4.5.13.1.
Make(s): ................................................................................................................................
1.2.4.5.13.2.
Type(s): .................................................................................................................................
1.2.4.5.13.3.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.13.4.
Material: ................................................................................................................................
1.2.4.5.13.5.
Operating temperatures:
............................................................................................... °C
1.2.4.5.14.
Non-return valve(s) or check valve(s): yes/ no
1.2.4.5.14.1.
Make(s): ................................................................................................................................
1.2.4.5.14.2.
Type(s): .................................................................................................................................
1.2.4.5.14.3.
Working pressure(s):
.................................................................................................... kPa

1.2.4.5.19.1.
Make(s): .................................................................................................................................
1.2.4.5.19.2.
Type(s): ..................................................................................................................................
1.2.4.5.19.3.
Drawings: ...............................................................................................................................
1.2.4.5.19.4.
Working pressure(s):
................................................................................................... MPa
1.2.4.5.19.5.
Material: .................................................................................................................................
1.2.4.5.19.6.
Operating temperatures:
................................................................................................. °C
1.2.4.5.19.7.
Set Values .............................................................................................................................
1.2.4.5.20.
LNG filling receptacle(s): yes/no
1.2.4.5.20.1.
Make(s): .................................................................................................................................
1.2.4.5.20.2.
Type(s): ..................................................................................................................................
1.2.4.5.20.3.
Description: ............................................................................................................................
1.2.4.5.20.4.
Working pressure(s):
.................................................................................................... kPa
1.2.4.5.20.5.
Material: .................................................................................................................................
1.2.4.5.21.
LNG pressure control regulator(s): yes/no
1.2.4.5.21.1.
Make(s): .................................................................................................................................
1.2.4.5.21.2.
Type(s): ..................................................................................................................................
1.2.4.5.21.3.
Description: ............................................................................................................................
1.2.4.5.21.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.21.5.
Material: .................................................................................................................................
1.2.4.5.22.
LNG Pressure and/or temperature sensor(s): yes/no
1.2.4.5.22.1.
Make(s): .................................................................................................................................
1.2.4.5.22.2.
Type(s): ..................................................................................................................................
1.2.4.5.22.3.
Description: ............................................................................................................................
1.2.4.5.22.4.
Working pressure(s):
................................................................................................... kPa
1.2.4.5.22.5.
Material: .................................................................................................................................
1.2.4.5.23.
LNG manual valve(s): yes/no

1.2.4.5.27.2. Type(s): ..................................................................................................................................
1.2.4.5.27.3. Description .............................................................................................................................
1.2.4.5.27.4. Working pressure(s) .................................................................................................... kPa
1.2.4.5.27.5. Material: .................................................................................................................................
1.2.4.5.28. LNG fuel pump(s): yes/no
1.2.4.5.28.1. Make(s): .................................................................................................................................
1.2.4.5.28.2. Type(s) ...................................................................................................................................
1.2.4.5.28.3. Description: ............................................................................................................................
1.2.4.5.28.4. Working pressure(s): .................................................................................................... kPa
1.2.4.5.28.5. Location inside/outside LNG tank
1.2.4.5.28.6. Operating temperatures: .....................................................................................................
1.2.4.5.29. Further documentation: ..........................................................................................................
1.2.4.5.29.1. Description of the CNG system / LNG system
1.2.4.5.29.2. System lay-out (electrical connections, vacuum connections compensation hoses, etc.): ...
...............................................................................................................................................
1.2.4.5.29.3. Drawing of the symbol: ..........................................................................................................
1.2.4.5.29.4. Adjustment data: ....................................................................................................................
1.2.4.5.29.5. Certificate of the vehicle on petrol, if already granted: ..........................................................
1.2.5. Cooling system: (liquid/air)

ANNEX 2B
COMMUNICATION
(maximum format: A4 (210 x 297mm))
issued by:
Name of administration:
.............................................
.............................................
.............................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITIVELY DISCONTINUED
of a type of CNG/LNG component pursuant to Regulation No. 110
Approval No.: ...................................................... Extension No.: .........................................................
1. CNG/LNG component considered:
Container(s) or cylinder(s)
Tank(s) or vessel(s)
Pressure indicator
Pressure relief valve
Automatic valve(s)
Excess flow valve
Gas-tight housing
Pressure regulator(s)
Non-return valve(s) or check valve(s)
Pressure relief device (PRD) (temperature triggered)
Manual valve
Flexible fuel lines
Filling unit or receptacle
Gas injector(s)
Gas flow adjuster
Gas/air mixer
Electronic control unit
Pressure and temperature sensor(s)
CNG filter(s)
PRD (pressure triggered)
Fuel rail
Heat exchanger(s)/vaporizer(s)

ANNEX 2B
ADDENDUM
1. ADDITIONAL INFORMATION CONCERNING THE TYPE-APPROVAL OF A TYPE OF
CNG/LNG COMPONENTS PURSUANT TO REGULATION NO 110
1.1. Natural Gas Storage System
1.1.1 Container(s) or Cylinder(s)(for CNG system)
1.1.1.1. Dimensions: .....................................................................................................................................
1.1.1.2. Material: ...........................................................................................................................................
1.1.2. Tank(s) or Vessel(s) (for LNG system)
1.1.2.1. Capacity: ........................................................................................................................................
1.1.2.2. Material: ...........................................................................................................................................
1.2. Pressure Indicator
1.2.1. Working pressure(s): ...................................................................................................................
1.2.2. Material: ...........................................................................................................................................
1.3. Pressure Relief Valve (Discharge Valve)
1.3.1. Working pressure(s): ....................................................................................................................
1.3.2. Material: ...........................................................................................................................................
1.4. Automatic Valve(s)
1.4.1. Working pressure(s): ...................................................................................................................
1.4.2. Material: ...........................................................................................................................................
1.5. Excess Flow Valve
1.5.1. Working pressure(s): ...................................................................................................................
1.5.2. Material: ...........................................................................................................................................
1.6. Gas-tight Housing
1.6.1. Working pressure(s): ...................................................................................................................
1.6.2. Material: ...........................................................................................................................................

1.15.2.
Material: ...........................................................................................................................................
1.16.
Electronic Control Unit
1.16.1.
Basic software principles: ................................................................................................................
1.17.
Pressure and Temperature Sensor(s)
1.17.1.
Working pressure(s):
...................................................................................................................
1.17.2.
Material: ...........................................................................................................................................
1.18.
CNG Filter(s)
1.18.1.
Working pressure(s):
...................................................................................................................
1.18.2.
Material: ...........................................................................................................................................
1.19.
PRD (Pressure Triggered)
1.19.1.
Working pressure(s):
............................................................................................................ MPa
1.19.2.
Material: ..........................................................................................................................................
1.20.
Fuel Rail(s)
1.20.1.
Working pressure(s)
:............................................................................................................. MPa
1.20.2.
Material: .......................................................................................................................................... .
1.21.
Heat Exchanger(s)/Vaporizer(s)
1.21.1.
Working pressure(s):
............................................................................................................. MPa
1.21.2.
Material: ............................................................................................................................................
1.22.
Natural Gas Detector(s):
1.22.1.
Working pressure(s):
............................................................................................................ MPa
1.22.2.
Material: .................................................................................................................................... MPa
1.23.
LNG Filling Receptacle(s)
1.23.1.
Working pressure(s):
............................................................................................................ MPa
1.23.2.
Material: .................................................................................................................................... MPa
1.24.
LNG Pressure Control Regulator(s)
1.24.1.
Working pressure(s):
............................................................................................................. MPa

ANNEX 2C
ARRANGEMENT OF APPROVAL MARKS
MODEL A
(See Paragraph 17.2. of this Regulation)
A ≥8mm
The above
approval mark affixed to t a vehicle shows that the vehicle has, with regard to the installation of
CNG/LNGG system for
the use of natural gass for propulsion, been approved in Italy (E3), pursuant to
Regulation No. 110 under approval number 012439. The first two digits of the approval number indicate
that the approval was
granted in accordance with the requirements of Regulationn No. 110 as
amended
by the 01 series of amendments.
The letter
"L" indicates
that the product is suitable for use with LNG.
The letter
"M" indicates that the product is suitable in moderate temperatures.
The letter
"C" indicates that the product is suitable in cold temperatures
s.
MODEL B
(See Paragraph 17.2. of this Regulation)
A ≥8mm
The above
approval mark affixed to t a vehicle shows that the vehicle has, with regard to the installation of
CNG/LNGG system for
the use of natural gass for propulsion, been approved in Italy (E3), pursuant to
Regulation No. 110 under approval number 012439. The first two digits of the approval number indicate
that at the
date the approval was granted in accordance with the requirements of Regulation No. 110 as
amended by the 01 series of amendments
s and that Regulation No. N 83 included the 05 series of
amendments.
The letter
"L" indicates
that the product is suitable for use with LNG.
The letter
"M" indicates that the product is suitable in moderate temperatures.
The letter
"C" indicates that the product is suitable in cold temperatures
s.

11.1.2. Tanks(s) or vessel(s): ......................................................................................................................
11.1.3. Specific components, etc. (see Paragraph 4.6. of the Regulation) .................................................
12. No. of report issued by that Service: ...............................................................................................
13. Approval granted/refused/extended/withdrawn ...........................................................................
14. Reason(s) of extension (if applicable): ............................................................................................
15. Place: ..............................................................................................................................................
16. Date: ................................................................................................................................................
17. Signature: ........................................................................................................................................
18. The following documents filed with the application or extension of approval can be obtained
upon request:
Drawings, diagrams and scheme plans regarding the components and the installation of the
CNG/LNG equipment considered to be of importance for the purpose of this Regulation;
Where applicable, drawings of the various equipment and their position in the vehicle.

ANNEX 3A
GAS CYLINDERS − HIGH PRESSURE CYLINDER FOR THE ON-BOARD STORAGE OF
CNG COMPRESSED NATURAL GAS AS A FUEL FOR AUTOMOTIVE VEHICLES
1. SCOPE
Cylinders covered by this Annex are Classified in Class 0, as described in Paragraph 3. of this
Regulation, and are:
CNG-1
CNG-2
CNG-3
CNG-4
Metal
Metal liner reinforced with resin impregnated continuous filament (hoop wrapped)
Metal liner reinforced with resin impregnated continuous filament (fully wrapped)
Resin impregnated continuous filament with a non-metallic liner (all composite)
Service conditions to which the cylinders will be subjected are detailed in Paragraph 4. of this
Annex. This Annex is based upon a working pressure for natural gas as a fuel of 20MPa settled
at 15°C with a maximum filling pressure of 26MPa. Other working pressures can be
accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a
25MPa working pressure system will require pressures to be multiplied by 1.25.
The service life of the cylinder shall be defined by the manufacturer and may vary with
applications. Definition of service life is based upon filling the cylinders 1,000 times a year for a
minimum of 15,000 fills. The maximum service life shall be 20 years.
For metal and metal-lined cylinders, the cylinder life is based upon the rate of fatigue crack
growth. The ultrasonic inspection, or equivalent, of each cylinder or liner is required to ensure
the absence of flaws which exceed the maximum allowable size. This approach permits the
optimised design and manufacture of light weight cylinders for natural gas vehicle service.
For all-composite cylinders with non-metallic non-load bearing liners the "safe life" is
demonstrated by appropriate design methods, design qualification testing and manufacturing
controls.
2. REFERENCES (see Paragraph 2. of this Regulation)
3. DEFINITIONS (see Paragraph 4. of this Regulation)
4 SERVICE CONDITIONS
4.1. General
4.1.1. Standard Service Conditions
The standard service conditions specified in this Section are provided as a basis for the design,
manufacture, inspection, testing, and approval of cylinders that are to be mounted permanently
on vehicles and used to store natural gas at ambient temperatures for use as a fuel on
vehicles.

4.2. Maximum Pressures
The cylinder pressure shall be limited to the following:
(a)
(b)
a pressure that would settle to 20MPa at a settled temperature of 15°C;
26MPa, immediately after filling, regardless of temperature;
4.3. Maximum Number of Filling Cycles
Cylinders are designed to be filled up to a settled pressure of 20MPa (200bar) at a settled gas
temperature of 15°C for up to 1,000 times per year of service.
4.4. Temperature Range
4.4.1. Settled Gas Temperature
Settled temperature of gas in cylinders may vary from a minimum of -40°C to a maximum of
65°C;
4.4.2. Cylinder Temperatures
The temperature of the cylinder materials may vary from a minimum of -40°C to a maximum of
+82°C;
Temperatures over +65°C may be sufficiently local, or of short enough duration, that the
temperature of gas in the cylinder never exceeds +65°C, except under the conditions of
Paragraph 4.4.3. below;
4.4.3. Transient Temperatures
Developed gas temperatures during filling and discharge may vary beyond the limits of
Paragraph 4.4.1. above;
4.5. Gas Composition
Methanol and/or glycol shall not be deliberately added to the natural gas. Cylinder should be
designed to tolerate being filled with natural gas meeting either of the following three
conditions:
(a)
(b)
SAE J1616
Dry gas
Water vapour would normally be limited to less than 32mg/m at a pressure dewpoint
of -9°C at 20MPa. There would be no constituent limits for dry gas, except for:
Hydrogen sulphide and other soluble sulphides:
Oxygen:
23mg/m
1% by volume

5. DESIGN APPROVAL
5.1. General
The following information shall be submitted by the cylinder designer with a request for
approval to the Type Approval Authority:
(a) statement of service (Paragraph 5.2.)
(b) design data (Paragraph 5.3.)
(c) manufacturing data (Paragraph 5.4.)
(d) quality system (Paragraph 5.5.)
(e) fracture performance and NDE (Non Destructive Examination) defect size
(Paragraph 5.6.);
(f) specification sheet (Paragraph 5.7.)
(g) additional supporting data (Paragraph 5.8.)
For cylinders designed in accordance with ISO 9809 it is not required to provide the stress
analysis report in Paragraph 5.3.2. or the information in Paragraph 5.6.
5.2. Statement of Service
The purpose of this statement of service is to guide users and installers of cylinders as well as
to inform the approving Type Approval Authority, or their designated representative. The
statement of service shall include:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
a statement that the cylinder design is suitable for use in the service conditions defined
in Paragraph 4 for the service life of the cylinder;
the service life;
the minimum in-service test and/or inspection requirements;
the pressure relief devices and/or insulation required;
support methods, protective coatings, etc., required but not provided;
a description of the cylinder design;
any other information necessary to ensure the safe use and inspection of the cylinder.

5.3.6. Cylinder Supports
Details of cylinder supports or support requirements shall be provided in accordance with
Paragraph 6.11. of this Annex.
5.4. Manufacturing Data
Details of all fabrication processes, non-destructive examinations, production tests and batch
tests shall be provided; The tolerances for all production processes such as heat treatment,
end forming, resin mix ratio, filament winding tension and speed, curing times and
temperatures, and auto-frettage procedures shall be specified; Surface finish, thread details,
acceptance criteria for ultrasonic scanning (or equivalent), and maximum lot sizes for batch
tests shall also be specified.
5.5. (Not Allocated)
5.6. Fracture Performance and NDE Defect Size
5.6.1. Fracture Performance
The manufacturer shall demonstrate the Leak-Before-Break performance of the design as
described in Paragraph 6.7.
5.6.2. NDE Defect Size
Using the approach described in Paragraph 6.15.2 the manufacturer shall establish the
maximum defect size for non-destructive examination which will prevent the failure of the
cylinder during its service life due to fatigue, or failure of the cylinder by rupture.
5.7. Specification Sheet
A summary of the documents providing the information required in Paragraph 5.1. above shall
be listed on a specification sheet for each cylinder design. The title, reference number, revision
numbers and dates of original issue and version issues of each document shall be given. All
documents shall be signed or initialled by the issuer; The specification sheet shall be given a
number, and revision numbers if applicable, that can be used to designate the cylinder design
and shall carry the signature of the engineer responsible for the design. Space shall be
provided on the specification sheet for a stamp indicating registration of the design.
5.8. Additional Supporting Data
Additional data which would support the application, such as the service history of material
proposed for use, or the use of a particular cylinder design in other service conditions, shall be
provided where applicable.

6.3. Materials
6.3.1. Materials used shall be suitable for the service conditions specified in Paragraph 4. of this
Annex. The design shall not have incompatible materials in contact. The design qualification
tests for materials are summarised in Table 6.1.
6.3.2. Steel
6.3.2.1. Composition
Steels shall be aluminium and/or silicon killed and produced to predominantly fine grain
practice. The chemical composition of all steels shall be declared and defined at least by:
(a)
(b)
carbon, manganese, aluminium and silicon contents in all cases;
nickel, chromium, molybdenum, boron and vanadium contents, and any other alloying
elements intentionally added. The following limits shall not be exceeded in the cast
analysis:
Tensile strength < 950MPa ≥ 950MPa
Sulphur 0.020% 0.010%
Phosphorus 0.020% 0.020%
Sulphur and Phosphorus 0.030% 0.025%
When carbon-boron steel is used, a hardenability test in accordance with ISO 642, shall be
performed on the first and last ingot or slab of each heat of steel. The hardness as measured in
a distance of 7.9mm from the quenched end, shall be within the range 33-53 HRC, or 327-560
HV, and shall be certified by the material manufacturer;
6.3.2.2. Tensile properties
The mechanical properties of the steel in the finished cylinder or liner shall be determined in
accordance with Paragraph A.1 (Appendix A to this Annex). The elongation for steel shall be at
least 14%;
6.3.2.3. Impact properties
The impact properties of the steel in the finished cylinder or liner shall be determined in
accordance with Paragraph A.2 (Appendix A to this Annex). Impact values shall not be less
than that indicated in Table 6.2 of this annex;
6.3.2.4. Bending properties
The bending properties of the welded stainless steel in the finished liner shall be determined in
accordance with Paragraph A.3. (Appendix A to this Annex).
6.3.2.5. Macroscopic weld examination
A macroscopic weld examination for each type of welding procedure shall be performed. It shall
show complete fusion and shall be free of any assembly faults or unacceptable defects as
specified according to level C in EN ISO 5817.

6.3.5. Fibres
Structural reinforcing filament material types shall be glass fibre, aramid fibre or carbon fibre. If
carbon fibre reinforcement is used the design shall incorporate means to prevent galvanic
corrosion of metallic components of the cylinder. The manufacturer shall keep on file the
published specifications for composite materials, the material manufacturer's recommendations
for storage, conditions and shelf life and the material manufacturer's certification that each
shipment conforms to said specification requirements. The fibre manufacturer shall certify that
the fibre material properties conform to the manufacturer's specifications for the product.
6.3.6 Plastic Liners
The tensile yield strength and ultimate elongation shall be determined in accordance with
Paragraph A.22 (Appendix A to this Annex). Tests shall demonstrate the ductile properties of
the plastic liner material at temperatures of -50°C or lower by meeting the values specified by
the manufacturer; The polymeric material shall be compatible with the service conditions
specified in Paragraph 4 of this Annex. In accordance with the method described in Paragraph
A.23 (Appendix A to this Annex), the softening temperature shall be at least 90°C, and the
melting temperature at least 100°C.
6.4. Test Pressure
The minimum test pressure used in manufacture shall be 30MPa;
6.5. Burst Pressures and Fibre Stress Ratios
For all types of cylinder the minimum actual burst pressure shall not be less than the values
given in Table 6.3 of this Annex. For Type CNG-2, CNG-3 and CNG-4 designs the composite
over-wrap shall be designed for high reliability under sustained loading and cyclic loading. This
reliability shall be achieved by meeting or exceeding the composite reinforcement stress ratio
values given in Table 6.3 of this Annex. Stress ratio is defined as the stress in the fibre at the
specified minimum burst pressure divided by the stress in the fibre at working pressure. The
burst ratio is defined as the actual burst pressure of the cylinder divided by the working
pressure; For Type CNG-4 designs, the stress ratio is equal to the burst ratio; For Type CNG-2
and CNG-3 designs (metal-lined, composite over-wrapped) stress ratio calculations shall
include:
(a)
(b)
(c)
(d)
(e)
(f)
An analysis method with capability for non-linear materials (special purpose computer
program or finite element analysis program);
Elastic-plastic stress-strain curve for liner material shall be known and correctly
modelled;
Mechanical properties of composite materials shall be correctly modelled;
Calculations shall be made at: auto-frettage, zero after auto-frettage, working and
minimum burst pressures;
Pre-stresses from winding tension shall be accounted for in the analysis;
Minimum burst pressure shall be chosen such that the calculated stress at minimum
burst pressure divided by the calculated stress at working pressure meets the stress
ratio requirements for the fibre used;

6.11. Cylinder Supports
The manufacturer shall specify the means by which cylinders shall be supported for installation
on vehicles. The manufacturer shall also supply support installation instructions, including
clamping force and torque to provide the required restraining force but not cause unacceptable
stress in the cylinder or damage to the cylinder surface.
6.12. Exterior Environmental Protection
The exterior of cylinders shall meet the requirements of the environmental test conditions of
Paragraph A.14 (Appendix A to this Annex). Exterior protection may be provided by using any
of the following:
(a)
(b)
(c)
a surface finish giving adequate protection (e.g. metal sprayed on aluminium, anodising);
or
the use of a suitable fibre and matrix material (e.g. carbon fibre in resin); or
a protective coating (e.g. organic coating, paint) that shall meet the requirements of
Paragraph A.9 (Appendix A to this Annex).
Any coatings applied to cylinders shall be such that the application process does not adversely
affect the mechanical properties of the cylinder. The coating shall be designed to facilitate
subsequent in service inspection and the manufacturer shall provide guidance on coating
treatment during such inspection to ensure the continued integrity of the cylinder.
Manufacturers are advised that an environmental performance test that evaluates the suitability
of coating systems is provided in the informative Appendix H to this Annex.
6.13. Design Qualification Tests
For the approval of each cylinder type the material, design, manufacture and examination shall
be proved to be adequate for their intended service by meeting the appropriate requirements of
the material qualification tests summarised in Table 6.1 of this Annex and the cylinder
qualification tests summarised in Table 6.4 of this Annex, with all tests in accordance with the
relevant methods of test as described in Appendix A to this Annex. The test cylinders or liners
shall be selected and the tests witnessed by the Competent Authority. If more cylinders or
liners are subjected to the tests than are required by this Annex, all results shall be
documented.
6.14. Batch Tests
The batch tests specified in this Annex for each cylinder type shall be conducted on cylinders
or liners taken from each batch of finished cylinders or liners. Heat treated witness samples
shown to be representative of finished cylinders or liners may also be used. Batch tests
required for each cylinder type are specified in Table 6.5 of this Annex.

6.16. Failure to Meet Test Requirements
In the event of failure to meet test requirements retesting or reheat treatment and retesting
shall be carried out as follows:
(a)
(b)
if there is evidence of a fault in carrying out a test, or an error of measurement, a further
test shall be performed. If the result of this test is satisfactory, the first test shall be
ignored;
If the test has been carried out in a satisfactory manner, the cause of test failure shall be
identified.
If the failure is considered to be due to the heat treatment applied, the manufacturer may
subject all the cylinders of the batch to a further heat treatment.
If the failure is not due to the heat treatment applied, all the identified defective cylinders shall
be rejected or repaired by an approved method. The non-rejected cylinders are then
considered as a new batch.
In both cases the new batch shall be retested. All the relevant prototype or batch tests needed
to prove the acceptability of the new batch shall be performed again. If one or more tests prove
even partially unsatisfactory, all cylinders of the batch shall be rejected.
6.17. Change of Design
A design change is any change in the selection of structural materials or dimensional change
not attributable to normal manufacturing tolerances.
Minor design changes shall be permitted to be qualified through a reduced test program.
Changes of design specified in Table 6.7. below shall require design qualification testing as
specified in the table.
Table 6.1
Material Design Qualification Test
Relevant Paragraph of this Annex
Steel
Aluminium
Resins
Fibres
Plastic liners
Tensile properties
6.3.2.2
6.3.3.4
6.3.5
6.3.6
Impact properties
6.3.2.3
Bending properties
6.3.2.4
Weld examination
6.3.2.5
Sulphide stress cracking resistance
6.3.2.6
Sustained load cracking resistance
6.3.3.3
Stress corrosion cracking
6.3.3.2
Shear strength 6.3.4.2
Glass transition temperature 6.3.4.3
Softening/Melting temperature 6.3.6
Fracture mechanics 6.7 6.7
Not required if flawed cylinder test approach in Paragraph A.7 of Appendix A to this Annex is used.

Table 6.4
Cylinder Design Qualification Tests
Test and Annex reference
Cylinder type
CNG−1 CNG−2 CNG−3 CNG−4
A.12 Burst X∗ X X X
A.13 Ambient temperature/cycle X∗ X X X
A.14 Acid environment test X X X
A.15 Bonfire X X X
A.16 Penetration X X X X
A.17 Flaw tolerance X X X X
A.18 High temp. creep X X X
A.19 Stress rupture X X X
A.20 Drop test X X
A.21 Permeation X
A.24 PRD performance X X X
A.25 Boss torque test X X
A.27 Natural gas cylinder X
A.6 LBB assessment X X
A.7 Extreme temperature/cycle X X X X
X = required
∗ = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests).
Test and Annex reference
A.12 Burst
A.13 Ambient cycle
A.1 Tensile
A.2 Impact (steel)
A.9.2 Coating ∗
Table 6.5
Batch Tests
Cylinder type
CNG−1 CNG−2 CNG−3 CNG−4
X
X
X
X
X
X = required
∗ = Except where no protective coating is used
† = Tests on liner material
X
X
X †
X †
X
X
X
X †
X †
X
X
X
X

7. TYPE CNG-1 METAL CYLINDERS
7.1. General
The design shall identify the maximum size of an allowable defect at any point in the cylinder
which will not grow to a critical size within the specified retest period, or service life if no retest
is specified, of a cylinder operating to the working pressure. Determination of leak-before-break
(LBB) performance shall be done in accordance with the appropriate procedures defined in
Paragraph A.6 (Appendix A to this Annex). Allowable defect size shall be determined in
accordance with Paragraph 6.15.2. above.
Cylinders designed in accordance with ISO 9809 and meeting all the requirements therein are
only required to meet the materials test requirements of Paragraph 6.3.2.4. above and the
design qualification test requirements of Paragraph 7.5., except Paragraphs 7.5.2. and 7.5.3.
below.
7.2. Stress Analysis
The stresses in the cylinder shall be calculated for 2MPa, 20MPa, test pressure and design
burst pressure. The calculations shall use suitable analysis techniques using thin-shell theory
that takes into account out-of-plane bending of the shell to establish stress distributions at the
neck, transition regions and the cylindrical part of the cylinder.
7.3. Manufacturing and Production Test Requirements
7.3.1. General
The ends of aluminium cylinders shall not be closed by a forming process. The base ends of
steel cylinders which have been closed by forming, except those cylinders designed in
accordance with ISO 9809, shall be NDE inspected or equivalent. Metal shall not be added in
the process of closure at the end. Each cylinder shall be examined before end forming
operations for thickness and surface finish.
After end forming the cylinders shall be heat treated to the hardness range specified for the
design. Localised heat treatment is not permitted.
When a neck ring, foot ring or attachments for support are provided, it shall be of material
compatible with that of the cylinder and shall be securely attached by a method other than
welding, brazing or soldering.
7.3.2. Non-destructive Examination
The following tests shall be carried out on each metallic cylinder:
(a)
(b)
Hardness test in accordance with Paragraph A.8 (Appendix A to this Annex),
Ultrasonic examination, in accordance with BS 5045, Part 1, Annex I, or demonstrated
equivalent NDT method, to ensure that the maximum defect size does not exceed the
size specified in the design as determined in accordance with Paragraph 6.15.2. above.
7.3.3. Hydrostatic Pressure Testing
Each finished cylinder shall be hydrostatically pressure tested in accordance with
Paragraph A.11 (Appendix A to this Annex).

(iv)
(v)
(vi)
should more than 6 months have expired since the last batch of production then a
cylinder from the next batch of production shall be pressure cycle tested in order to
maintain the reduced frequency of batch testing in (ii) or (iii) above.
should any reduced frequency pressure cycle test cylinder in (ii) or (iii) above fail
to meet the required number of pressure cycles (minimum 22,500 or
30,000 pressure cycles, respectively,) then it shall be necessary to repeat the
batch pressure cycle test frequency in (i) for a minimum 10 production batches in
order to re-establish the reduced frequency of batch pressure cycle testing in (ii) or
(iii) above.
should any cylinder in (i), (ii), or (iii) above fail to meet the minimum cycle life
requirement of 1,000 cycles times the specified service life in years (minimum
15,000 cycles), then the cause of failure shall be determined and corrected
following the procedures in Paragraph 6.16. of this Annex. The pressure cycle test
shall then be repeated on an additional three cylinders from that batch. Should any
of the three additional cylinders fail to meet the minimum pressure cycling
requirement of 1,000 cycles times the specified service life in years, then the batch
shall be rejected.
7.5. Cylinder Design Qualification Tests
7.5.1. General
Qualification testing shall be conducted on finished cylinders which are representative of
normal production and complete with identification marks. Selection, witnessing and
documentation of the results shall be in accordance with Paragraph 6.13. above.
7.5.2. Hydrostatic Pressure Burst Test
Three representative cylinders shall be hydrostatically pressurised to failure in accordance with
Paragraph A.12. (Appendix A to this Annex). The cylinder burst pressures shall exceed the
minimum burst pressure calculated by the stress analysis for the design, and shall be at least
45MPa.
7.5.3. Ambient Temperature Pressure Cycling Test.
Two finished cylinders shall be pressure cycled at ambient temperature in accordance with
Paragraph A.13 (Appendix A to this Annex) to failure, or to a minimum of 45,000 cycles. The
cylinders shall not fail before reaching the specified service life in years times 1,000 cycles.
Cylinders exceeding 1,000 cycles times the specified service life in years shall fail by leakage
and not by rupture. Cylinders which do not fail within 45,000 cycles shall be destroyed either by
continuing the cycling until failure occurs, or by hydrostatically pressurising to burst. The
number of cycles to failure and the location of the failure initiation shall be recorded.
7.5.4. Bonfire Test
Tests shall be conducted in accordance with Paragraph A.15 (Appendix A to this Annex) and
meet the requirements therein.

8.3. Manufacturing Requirements
8.3.1. General
8.3.2. Liner
The composite cylinder shall be fabricated from a liner over-wrapped with continuous filament
windings. Filament winding operations shall be computer or mechanically controlled. The
filaments shall be applied under controlled tension during winding. After winding is complete,
thermosetting resins shall be cured by heating, using a predetermined and controlled
time-temperature profile.
The manufacture of a metallic liner shall meet the requirements given under Paragraph 7.3.
above for the appropriate type of liner construction.
8.3.3. Over-wrap
The cylinders shall be fabricated in a filament winding machine. During winding the significant
variables shall be monitored within specified tolerances, and documented in a winding record.
These variables can include but are not limited to:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
fibre type including sizing;
manner of impregnation;
winding tension;
winding speed;
number of rovings;
band width;
type of resin and composition;
temperature of the resin;
temperature of the liner.
8.3.3.1. Curing of thermosetting resins
If a thermosetting resin is used, the resin shall be cured after filament winding. During the
curing, the curing cycle (i.e. the time-temperature history) shall be documented.
The curing temperature shall be controlled and shall not affect the material properties of the
liner. The maximum curing temperature for cylinders with aluminium liners is 177°C.
8.3.4. Auto-frettage
Auto-frettage, if used, shall be carried out before the hydrostatic pressure test. The
auto-frettage pressure shall be within the limits established in Paragraph 8.2.3. above, and the
manufacturer shall establish the method to verify the appropriate pressure.

Where the coating fails to meet the requirements of Paragraph A.9.2. (Appendix A to this
Annex), the batch shall be 100% inspected to remove similarly defective cylinders. The
coating on all defective cylinders may be stripped using a method that does not affect the
integrity of the composite wrapping, and recoated. The coating batch test shall then be
repeated.
(b)
(c)
Batch burst test. One cylinder shall be tested in accordance with the requirements of
Paragraph 7.4(b) above;
Periodic pressure cycling test. In accordance with the requirements of Paragraph 7.4(c)
above.
8.6. Cylinder Design Qualification Tests
8.6.1. General
Qualification testing shall be conducted on cylinders which are representative of normal
production and complete with identification marks. Selection, witnessing and documentation of
the results shall comply with Paragraph 6.13. above.
8.6.2. Hydrostatic Pressure Burst Test
(a)
One liner shall be hydrostatically burst in accordance with Paragraph A.12. (Appendix A
to this Annex). The burst pressure shall exceed the minimum burst pressure specified for
the liner design;
(b) Three cylinders shall be hydrostatically burst in accordance with Paragraph A.12
(Appendix A to this Annex). Cylinder burst pressures shall exceed the specified minimum
burst pressure established by the stress analysis for the design, in accordance with
Table 6.3, and in no case less than the value necessary to meet the stress ratio
requirements of Paragraph 6.5 above.
8.6.3. Ambient Temperature Pressure Cycling Test
Two finished cylinders shall be pressure cycle tested at ambient temperature in accordance
with Paragraph A.13. (Appendix A to this Annex) to failure, or to a minimum of 45,000 cycles.
The cylinders shall not fail before reaching the specified service life in years times 1,000 cycles.
Cylinders exceeding 1,000 cycles times the specified service life in years shall fail by leakage
and not by rupture. Cylinders which do not fail within 45,000 cycles shall be destroyed either by
continuing the cycling until failure occurs, or by hydrostatically pressurising to burst. Cylinders
exceeding 45,000 cycles are permitted to fail by rupture. The number of cycles to failure and
the location of the failure initiation shall be recorded.
8.6.4. Acid Environment Test
One cylinder shall be tested in accordance with Paragraph A.14. (Appendix A to this Annex)
and meet the requirements therein. An optional environmental test is included in the informative
Appendix H to this Annex.
8.6.5. Bonfire Test
Finished cylinders shall be tested in accordance with Paragraph A.15. (Appendix A to this
Annex) and meet the requirements therein.

9.2.3. Stress Analysis
The stresses in the tangential and longitudinal direction of the cylinder in the composite and in
the liner after pressure shall be calculated. The pressure used for these calculations shall be
zero, working pressure, 10% of working pressure, test pressure and design burst pressure. The
limits within which auto-frettaging pressure shall fall, shall be calculated, The calculations shall
use suitable analysis techniques using thin-shell theory taking account of non-linear material
behaviour of the liner to establish stress distributions at the neck, transition regions and the
cylindrical part of the liner.
9.3. Manufacturing Requirements
Manufacturing requirements shall be in accordance with Paragraph 8.3. above except that the
over-wrap shall also include helically wound filaments.
9.4. Production Test Requirements
Production test requirements shall be in accordance with the requirements of Paragraph 8.4.
above.
9.5. Cylinder Batch Tests
The batch tests shall be in accordance with the requirements of Paragraph 8.5. above.
9.6. Cylinder Design Qualification Tests
Cylinder design qualification tests shall be in accordance with the requirements of
Paragraph 8.6. above, and Paragraph 9.6.1. below, except that the liner burst in Paragraph 8.6.
above is not required.
9.6.1. Drop Test
One or more finished cylinders shall be drop tested in accordance with Paragraph A.30
(Appendix A to this Annex).
10. TYPE CNG-4 ALL-COMPOSITE CYLINDERS
10.1. General
This Annex does not give a definite method for the design of cylinders with polymeric liners
because of the variety of cylinder designs possible.
10.2. Design Requirements
Design calculations shall be used to provide justification of design adequacy. The tensile
stresses in the fibres shall meet the requirements of Paragraph 6.5. above.
Tapered and straight threads in accordance with Paragraph 6.10.2. or 6.10.3. above shall be
used on the metal end bosses.
Metal end bosses with threaded openings shall be able to withstand a torque force of 500Nm,
without damaging the integrity of the connection to the non-metallic liner. The metal end bosses
connected to the non-metallic liner shall be of a material compatible with the service conditions
specified in Paragraph 4. of this Annex.

(iv)
When a protective coating is a part of the design, the coating shall be tested in
accordance with Paragraph A.9.2 (Appendix A to this Annex). Where the coating
fails to meet the requirements of Paragraph A.9.2 (Appendix A to this Annex), the
batch shall be 100% inspected to remove similarly defective cylinders. The coating
on all defective cylinders may be stripped using a method that does not affect the
integrity of the composite wrapping, and recoated. The coating batch test shall
then be repeated.
(b)
Batch burst test
One cylinder shall be tested in accordance with the requirements of Paragraph 7.4(b)
above;
(c)
Periodic pressure cycling test
On one cylinder the end boss shall be torque tested to 500Nm in accordance with the
test method in Paragraph A.25. (Appendix A to this Annex). The cylinder shall then be
pressure cycle tested in accordance with the procedures provided in Paragraph 7.4.(c)
above.
Following the required pressure cycling, the cylinder shall be leak tested in accordance
with the method described in Paragraph A.10. (Appendix A to this Annex) and meet the
requirements therein.
10.7. Cylinder Design Qualification Tests
10.7.1. General
Cylinder design qualification tests shall be in accordance with the requirements of
Paragraphs 8.6., 10.7.2., 10.7.3. and 10.7.4. of this Annex, except that the LBB performance in
Paragraph 8.6.10. above is not required.
10.7.2. Boss Torque Test
One cylinder shall be tested in accordance with Paragraph A.25. (Appendix A to this Annex).
10.7.3. Permeation Test
One cylinder shall be tested for permeation in accordance with Paragraph A.21. (Appendix A to
this Annex) and meet the requirements therein.
10.7.4. Natural Gas Cycling Test
One finished cylinder shall be tested in accordance with Paragraph A.27. (Appendix A to this
Annex) and meet the requirements therein.

(b)
Non-mandatory information:
On a separate label(s) the following non-mandatory information may be provided:
(i)
Gas temperature range, e.g. -40°C to 65°C;
(ii) Nominal water capacity of the cylinder to two significant numbers. e.g. 120L;
(iii)
Date of original pressure test (month and year).
The markings shall be placed in the listed sequence but the specific arrangement may
be varied to match the space available. An acceptable example of mandatory information
is:
CNG ONLY
DO NOT USE AFTER . ./. . . .
Manufacturer/Part Number/Serial Number
20MPa/15°C
ECE R 110 CNG-2 (Registration No. ….)
"Use Only Manufacturer-Approved Pressure Relief Device"
12. PREPARATION FOR DISPATCH
Prior to dispatch from the manufacturers shop, every cylinder shall be internally clean and
dried. Cylinders not immediately closed by the fitting of a valve, and safety devices if
applicable, shall have plugs, which prevent entry of moisture and protect threads, fitted to all
openings. A corrosion inhibitor (e.g. oil-containing) shall be sprayed into all steel cylinders and
liners prior to dispatch.
The manufacturer's statement of service and all necessary information to ensure the proper
handling, use and in-service inspection of the cylinder shall be supplied to the purchaser. The
statement shall be in accordance with Appendix D to this Annex.

A.5.
SUSTAINED LOAD CRACKING TESTS, ALUMINIUM
The resistance to SLC shall be carried out in accordance with Annex D of ISO/DIS 7866 and
shall meet the requirements therein;
A.6.
LEAK-BEFORE-BREAK (LBB) PERFORMANCE TEST
Three finished cylinders shall be pressure cycled between not more than 2MPa and not less
than 30MPa at a rate not to exceed 10 cycles per minute.
All cylinders shall fail by leakage.
A.7.
EXTREME TEMPERATURE PRESSURE CYCLING
Finished cylinders, with the composite wrapping free of any protective coating, shall be cycle
tested, without showing evidence of rupture, leakage, or fibre unravelling, as follows:
(a)
(b)
(c)
(d)
Condition for 48h at zero pressure, 65°C or higher, and 95% or greater relative humidity.
The intent of this requirement shall be deemed met by spraying with a fine spray or mist
of water in a chamber held at 65°C;
Hydrostatically pressurised for 500 cycles times the specified service life in years
between not more than 2MPa and not less than 26MPa at 65° or higher and 95%
humidity;
Stabilise at zero pressure and ambient temperature;
Then pressurise from not more than 2MPa to not less than 20MPa for 500 cycles times
the specified service life in years at -40°C or lower;
The pressure cycling rate of b) shall not exceed 10 cycles per minute. The pressure cycling
rate of d) shall not exceed 3 cycles per minute unless a pressure transducer is installed directly
within the cylinder. Adequate recording instrumentation shall be provided to ensure the
minimum temperature of the fluid is maintained during the low temperature cycling.
Following pressure cycling at extreme temperatures, cylinders shall be hydrostatically
pressured to failure in accordance with the hydrostatic burst test requirements, and achieve a
minimum burst pressure of 85% of the minimum design burst pressure. For Type CNG-4
designs, prior to the hydrostatic burst test the cylinder shall be leak tested in accordance with
Paragraph A.10. below.
A.8.
BRINELL HARDNESS TEST
Hardness tests shall be carried out on the parallel wall at the centre and a domed end of each
cylinder or liner in accordance with ISO 6506. The test shall be carried out after the final heat
treatment and the hardness values thus determined shall be in the range specified for the
design.

A.10.
LEAK TEST
Type CNG-4 designs shall be leak tested using the following procedure (or an acceptable
alternative);
(a)
(b)
cylinders shall be thoroughly dried and pressurised to working pressure with dry air or
nitrogen, and containing a detectable gas such as helium;
any leakage measured at any point that exceeds 0.004 standard cm /h shall be cause for
rejection.
A.11.
HYDRAULIC TEST
One of the following two options shall be used:
Option 1: Water Jacket Test
(a)
(b)
(c)
The cylinder shall be hydrostatically tested to at least 1.5 times working pressure. In no
case may the test pressure exceed the auto-frettage pressure;
Pressure shall be maintained for a sufficiently long period (at least 30s) to ensure
complete expansion. Any internal pressure applied after auto-frettage and previous to
the hydrostatic test shall not exceed 90% of the hydrostatic test pressure. If the test
pressure cannot be maintained due to failure of the test apparatus, it is permissible to
repeat the test at a pressure increased by 700kPa. Not more than 2 such repeat tests
are permitted;
The manufacturer shall define the appropriate limit of permanent volumetric expansion
for the test pressure used, but in no case shall the permanent expansion exceed 5% of
the total volumetric expansion measured under the test pressure. For Type CNG-4
designs, the elastic expansion shall be established by the manufacturer. Any cylinders
not meeting the defined rejection limit shall be rejected and either destroyed or used for
batch test purposes.
Option 2: Proof Pressure Test
The hydrostatic pressure in the cylinder shall be increased gradually and regularly until the test
pressure, at least 1.5 times working pressure, is reached. The cylinder test pressure shall be
held for a sufficiently long period (at least 30s) to ascertain that there is no tendency for the
pressure to decrease and that tightness is guaranteed;
A.12.
HYDROSTATIC PRESSURE BURST TEST
(a)
(b)
The rate of pressurisation shall not exceed 1.4MPa per second (200lb/s ) at pressures in
excess of 80% of the design burst pressure. If the rate of pressurisation at pressures in
excess of 80% of the design burst pressure exceeds 350kPa/s (50lb/s ), then either the
cylinder shall be placed schematically between the pressure source and the pressure
measurement device, or there shall be a 5s hold at the minimum design burst pressure;
The minimum required (calculated) burst pressure shall be at least 45MPa, and in no
case less than the value necessary to meet the stress ratio requirements. Actual burst
pressure shall be recorded. Rupture may occur in either the cylindrical region or the
dome region of the cylinder.

A.15.4.
Temperature and Pressure Measurements
Surface temperatures shall be monitored by at least three thermocouples located along the
bottom of the cylinder and spaced not more than 0.75m apart; Metallic shielding shall be used
to prevent direct flame impingement on the thermocouples. Alternatively, thermocouples may
be inserted into blocks of metal measuring less than 25mm square.
The pressure inside the cylinder shall be measured by a pressure sensor without modify the
configuration of the system under test.
Thermocouple temperatures and the cylinder pressure shall be recorded at intervals of every
30s or less during the test.
A.15.5.
General Test Requirements
Cylinders shall be pressurised with natural gas and tested in the horizontal position at both:
(a)
(b)
working pressure;
25% of the working pressure.
Immediately following ignition, the fire shall produce flame impingement on the surface of the
cylinder along the 1.65m length of the fire source and across the cylinder diameter. Within 5min
of ignition, at least one thermocouple shall indicate a temperature of at least 590°C. This
minimum temperature shall be maintained for the remaining duration of the test.
A.15.6.
Cylinders 1.65m Length or Less
The centre of the cylinder shall be positioned over the centre of the fire source;
A.15.7.
Cylinders Greater than 1.65m Length
If the cylinder is fitted with a pressure relief device at one end, the fire source shall commence
at the opposite end of the cylinder; If the cylinder is fitted with pressure relief devices at both
ends, or at more than one location along the length of the cylinder, the centre of the fire source
shall be centred midway between the pressure relief devices that are separated by the greatest
horizontal distance.
If the cylinder is additionally protected using thermal insulation, then two fire tests at service
pressure shall be performed, one with the fire centred midway along the cylinder length, and
the other with the fire commencing at one of the cylinder ends.
A.15.8.
Acceptable Results
The cylinder shall vent through a pressure relief device.

A.20.
IMPACT DAMAGE TEST
One or more finished cylinders shall be drop tested at ambient temperature without internal
pressurisation or attached valves. The surface onto which the cylinders are dropped shall be a
smooth, horizontal concrete pad or flooring. One cylinder shall be dropped in a horizontal
position with the bottom 1.8m above the surface onto which it is dropped. One cylinder shall be
dropped vertically on each end at a sufficient height above the floor or pad so that the potential
energy is 488J, but in no case shall the height of the lower end be greater than 1.8m. One
cylinder shall be dropped at a 45° angle onto a dome from a height such that the centre of
gravity is at 1.8m; however, if the lower end is closer to the ground than 0.6m, the drop angle
shall be changed to maintain a minimum height of 0.6m and a centre of gravity of 1.8m.
Following the drop impact, the cylinders shall be pressure cycled from not more than 2MPa to
not less than 26MPa bar for 1,000 cycles times the specified service life in years. The cylinders
may leak but not rupture, during the cycling. Any cylinders completing the cycling test shall be
destroyed;
A.21.
PERMEATION TEST
This test is only required on Type CNG-4 designs. One finished cylinder shall be filled with
compressed natural gas or a 90% nitrogen/10% helium mixture to working pressure, placed in
an enclosed sealed chamber at ambient temperature, and monitored for leakage for a time
sufficient to establish a steady state permeation rate. The permeation rate shall be less than
0.25ml of natural gas or helium per hour per litre water capacity of the cylinder.
A.22.
TENSILE PROPERTIES OF PLASTICS
The tensile yield strength and ultimate elongation of plastic liner material shall be determined at
-50°C using ISO 3628, and meet the requirements of Paragraph 6.3.6. of Annex 3A.
A.23.
MELTING TEMPERATURE OF PLASTICS
Polymeric materials from finished liners shall be tested in accordance with the method
described in ISO 306, and meet the requirements of Paragraph 6.3.6. of Annex 3A.
A.24.
PRESSURE RELIEF DEVICE REQUIREMENTS
Pressure relief device specified by the manufacturer shall be shown to be compatible with the
service conditions listed in Paragraph 4. of Annex 3A and through the following qualification
tests:
(a)
(b)
One specimen shall be held at a controlled temperature of not less than 95°C and a
pressure not less than test pressure (30MPa) for 24hs. At the end of this test there shall
be no leakage or visible sign of extrusion of any fusible metal used in the design.
One specimen shall be fatigue tested at a pressure cycling rate not to exceed 4 cycles
per minute as follows:
(i)
(ii)
held at 82°C while pressured for 10,000 cycles between 2MPa and 26MPa;
held at -40°C while pressure for 10,000 cycles between 2MPa and 20MPa.
At the end of this test there shall be no leakage, or any visible sign of extrusion of any
fusible metal used in the design.

ANNEX 3A – APPENDIX D
REPORT FORMS
NOTE - This appendix is not a mandatory part of this Annex.
The following forms should be used:
(1) Report of Manufacture & Certificate of Conformity - Required to be clear, legible and in the format
of Form 1:
(2) Report of Chemical Analysis of Material for Metallic Cylinders, Liners, or Bosses - Required
essential elements, identification, etc.
(3) Report of Mechanical Properties of Material for Metallic Cylinders and Liners - Required to report
all tests required by this Regulation.
(4) Report of Physical and Mechanical Properties of Materials for Non Metallic Liners - Required to
report all tests and information required in this Regulation.
(5) Report of Composite Analysis - Required to report all tests and data required in this Regulation.
(6) Report of Hydrostatic Tests, Periodic Pressure Cycling and Burst Tests - Required to report test
and data required in this Regulation.

ANNEX 3A – APPENDIX E
VERIFICATION OF STRESS RATIOS USING STRAIN GAUGES
1. The stress-strain relationship for fibres is always elastic, therefore, stress ratios and strain
ratios are equal.
2. High elongation strain gauges are required.
3. Strain gauges should be orientated in the direction of the fibres on which they are mounted
(i.e. with hoop fibre on the outside of the cylinder, mount gauges in the hoop direction).
4. Method 1 (applies to cylinders that do not use high tension winding)
(a)
(b)
(c)
Prior to auto-frettage, apply strain gauges and calibrate;
Measure strains at auto-frettage, zero after auto-frettage, working, and minimum burst
pressure have been met;
Confirm that the strain at burst pressure divided by strain at working pressure meets the
stress ratio requirements. For hybrid construction, the strain at working pressure, is
compared with the rupture strain of cylinders reinforced with a single fibre type.
5. Method 2 (applies to all cylinders)
(a)
(b)
(c)
(d)
(e)
At zero pressure after winding and auto-frettage, apply strain gauges and calibrate;
Measure strains at zero, working, and minimum burst pressure;
At zero pressure, after strain measurements have been taken at the working and
minimum burst pressures, and with strain gauges monitored, cut the cylinder section
apart so that the region containing the strain gauge is approximately five inches long.
Remove the liner without damaging the composite. Measure the strains after the liner is
removed.
Adjust the strain readings at zero, working, and minimum burst pressures by the amount
of strain measured at zero pressure with and without the liner.
Confirm that the strain at burst pressure divided by strain at working pressure meets the
stress ratio requirements. For hybrid construction, the strain at working pressure is
compared with the rupture strain of cylinders reinforced with a single fibre type.

F.2.2.
LBB by Flawed Cylinder Burst
A fracture test shall be performed by the cylinder side wall. If the fatigue sensitive locations as
determined in Paragraph F.1. above is outside the side wall, the fracture test shall also be
performed at that location. The test procedure is as follows:
(a)
Determination of leak-before-break flaw length
The length of the LBB flaw at the fatigue sensitive site shall be twice the length of the
maximum length measured of the resultant through-wall surface crack from the three
cylinders cycle tested to failure under the design qualification tests for each type of
design;
(b)
Cylinder flaws
For Type CNG-1 designs having the fatigue sensitive site in the cylindrical part in the
axial direction, external flaws shall be machined longitudinally, approximately at midlength
of the cylindrical part of the cylinder. The flaws shall be located at minimum wall
thickness of the midsection based on thickness measurements at four points around the
cylinder. For Type CNG-1 designs having the fatigue sensitive site outside the cylindrical
part, the LBB flaw shall be introduced at the internal surface of the cylinder along the
fatigue sensitive orientation. For Type CNG-2 and CNG-3 designs the LBB flaw shall be
introduced in the metal liner;
For flaws to be tested by monotonic pressure, the flaw cutter shall be approximately
12.5mm thick with an angle of 45°C and a tip radius of 0.25mm maximum. The cutter
diameter shall be 50mm for cylinder with outside diameter less than 140mm, and 65 to
80mm for cylinders with outside diameter greater than 140mm (A standard CVN cutter is
recommended).
Note: The cutter should be sharpened regularly to assure tip radius meets
specification.
The depth of the flaw may be adjusted to obtain a leak by monotonic
hydro-pressurisation. The crack shall not propagate by more than 10% outside of the
machined flaw measured on the external surface:
(c)
Test procedure
The test shall be performed by monotonic pressurisation or cyclic pressurisation as
described below:
(i)
Monotonic pressurisation to burst
The cylinder shall be pressurised hydrostatically until pressure is released from
the cylinder at the flaw location. The pressurisation shall be performed as
described in Paragraph A.12. (Appendix A to this Annex);
(ii)
Cyclic pressure
The test procedure shall be in accordance with the requirements of
Paragraph A.13. of Appendix A to this Annex.

(g)
Using the above steps, calculate the maximum allowable defect depth and length which
shall not cause the failure of the cylinder during the design life due to either fatigue or
rupture. The defect size for NDE shall be equal to or less than the calculated maximum
allowable defect size for the design.
F.3.2.
NDE Defect Size by Flawed Cylinder Cycling
For Type CNG-1, CNG-2 and CNG-3 designs, three cylinders containing artificial defects that
exceed the defect length and depth detection capability of the NDE inspection method required
in Paragraph 6.15. of Annex 3A, shall be pressure cycled to failure in accordance with the test
method in Paragraph A.13. (Appendix A to this Annex). For Type CNG-1 designs having a
fatigue sensitive site in the cylindrical part, external flaws shall be introduced on the side wall.
For Type CNG-1 designs having the fatigue sensitive site outside the side wall, and for Type
CNG-2 and CNG-3 designs, internal flaws shall be introduced. Internal flaws may be machined
prior to the heat treating and closing of the end of the cylinder.
The cylinders shall not leak or rupture in less than 15,000 cycles; The allowable defect size for
NDE shall be equal to or less than the artificial flaw size at that location.

G.7.
IN-SERVICE INSPECTION
The manufacturer shall clearly specify the user's obligation to observe the required cylinder
inspection requirements (e.g. re-inspection interval, by authorised personnel). This information
shall be in agreement with the design approval requirements.

Figure H.1
Cylinder Orientation and Layout of Exposure Areas
H.4.
PRECONDITIONING APPARATUS
The following apparatus are needed for preconditioning the test cylinder by pendulum and
gravel impact.
(a)
Pendulum impact
The impact body shall be of steel and have the shape of a pyramid with equilateral
triangle faces and a square base, the summit and the edges being rounded to a radius of
3mm. The centre of percussion of the pendulum shall coincide with the centre of gravity
of the pyramid; its distance from the axis of rotation of the pendulum shall be 1m. The
total mass of the pendulum referred to its centre of percussion shall be 15kg. The energy
of the pendulum at the moment of impact shall be not less than 30Nm and as close to
that value as possible.
During pendulum impact, the cylinder shall be held in position by the end bosses or by
the intended mounting brackets.
(b)
Gravel impact
Machine constructed according to the design specifications shown in Figure H.2. This
procedure for operation of the equipment shall follow that described in ASTM D3170,
Standard Test Method for Chip Resistance of Coatings with the exception that the
cylinder may be at ambient temperature during gravel impact;
(c)
Gravel
Alluvial road gravel passing through a 16mm space screen but retained on a 9.5mm
space screen. Each application is to consist of 550ml of graded gravel
(approximately. 250 to 300st).

(b)
Other fluid exposure
At the appropriate stage in test sequence (Table 1) each marked area is to be exposed
to one of five solutions for 30min. The same environment shall be used for each location
throughout the test. The solutions are:
Sulphuric acid:
19% solution by volume in water;
Sodium hydroxide:
25% solution by weight in water;
Methanol/ gasoline:
30/70% concentrations;
Ammonium nitrate:
28% by weight in water;
Windshield washer fluid.
When exposed, the test sample will be oriented with the exposure area uppermost. A
pad of glass wool one layer thick (approximately 0.5mm) and trimmed to the appropriate
dimensions is to be placed on the exposure area. Using a pipet, apply 5ml of the test
fluid to the exposure area. Remove the gauze pad after pressurisation of the cylinder for
30min.
H.6.
TEST CONDITIONS
(a)
Pressure cycle
As defined in the test sequence, cylinder shall be hydraulically pressure cycled between
not more than 2MPa and not less than 26MPa. The total cycle shall be not less than 66s
and will include a 60s minimum hold at 26MPa. The nominal cycle process will be:
Ramp up from ≤20MPa to ≥26MPa;
Hold at ≥26MPa for 60s minimum;
Ramp down from ≥26MPa to ≤2MPa;
Total minimum cycle time to be 66s.
(b)
Pressure during other fluid exposure
Following application of the other fluids, the cylinder shall be pressured to not less than
26MPa for a minimum of 30min;
(c)
High and low temperature exposure
As defined in the test sequence, the entire cylinder shall be exposed to high or low
temperature air in contact with external surface. The low temperature air shall be -40°C
or lower and the high temperature air shall be 82°C ± 5°C. For the low temperature
exposure, the fluid temperature of Type CNG-1 cylinders shall be monitored using a
thermocouple installed within the cylinder to ensure it remains at -40°C or lower.

ANNEX 3B
LIQUID TANKS - VACUUM INSULATED VESSELS FOR THE ON-BOARD STORAGE OF
NATURAL GAS AS A FUEL FOR AUTOMOTIVE VEHICLES
1. SCOPE
This Annex sets out minimum requirements for refillable liquid tanks. The tanks are intended
only for the on-board storage of liquid natural gas as a fuel for automotive vehicles to which the
tanks are to be fixed. Tanks shall be of any austenitic stainless steel material, design or method
of manufacture suitable for the specified service conditions.
Tanks for LNG covered by this Annex are classified in Class 5.
Service conditions to which the tanks will be subjected are detailed in Paragraph 4. below.
This Annex is based upon a working pressure less than 26MPa. Working Pressures (WP) can
be accommodated by adjusting the test pressure by the appropriate factor (ratio) using the
following formula:
Ptest = 1.3 (WP + 0.1) [MPa]
The service life of the tanks shall be defined by the manufacturer and may vary with
applications.
2. SERVICE CONDITIONS
2.1 General
2.1.1. Standard Service Conditions
The standard service conditions specified in this section are provided as a basis for the design,
manufacture, inspection, testing, and approval of tanks that are to be mounted permanently on
vehicles and used to store natural gas at cryogenic temperatures for use as a fuel on vehicles.
2.1.2. Use of Tanks
The service conditions specified are also intended to provide information on how tanks made to
this Regulation may safely be used to:
(a)
(b)
(c)
(d)
(e)
(f)
Manufacturers of tanks;
Owners of tanks;
Designers or contractors responsible for the installation of tanks;
Designers or owners of equipment used to refuel vehicle tanks;
Suppliers of natural gas; and
Regulatory authorities who have jurisdiction over tank use.

2.6. Leakage and Venting
In the case of LNG tanks are located in enclosed spaces for extended periods of time (e.g. for
service), leakage and venting of natural gas (or other flammable substances) from the tank
shall be dealt with properly to avoid the dangers due to releasing flammable substances in
enclosed spaces.
2.7. Vehicle LNG tank(s) shall have a design hold time (build without relieving) minimum of 5 days
after being filled net full and at the highest point in the design filling temperature/pressure
range.
3. DESIGN APPROVAL
3.1. General
The following information shall be submitted by the tank designer or manufacturer with a
request for approval to the Type Approval Authority:
(a) Statement of service (Paragraph 3.2.);
(b) Design data (Paragraph 3.3.);
(c) Manufacturing data (Paragraph 3.3.7.);
(d) Specification sheet (Paragraph 3.3.8.);
(e) Additional supporting data (Paragraph 3.3.9.1.).
3.2. Statement of Service
The purpose of this statement of service is to guide users and installers of tanks as well as to
inform the Type Approval Authority, or their designated representative. The statement of
service shall include:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
A statement that the tank design is suitable for use in the service conditions defined in
Paragraph 4. for the service life of the tank;
The service life;
The minimum in-service test and/or inspection requirements;
The pressure relief devices required;
Support methods, etc., required but not provided;
A description of the tank design;
Design hold time;
Any other information necessary to ensure the safe use and inspection of the tank.

3.3.5. Fire Protection
The arrangement of pressure relief devices that will protect the tank from sudden rupture when
exposed to the fire conditions in Paragraph A.1. of Appendix A to this Annex shall be specified.
Test data shall substantiate the effectiveness of the specified fire protection system.
3.3.6. Tank Supports
Details of tank supports or support requirements shall be provided in accordance with
Paragraph 4.11.
3.3.7. Manufacturing Data
Descriptions of fabrication processes and production tests shall be provided.
The following shall be in accordance with EN 1251-2 (2000):
(a)
(b)
(c)
(d)
(e)
(f)
(g)
Quality system;
Cutting;
Cold forming;
Hot forming;
Manufacturing tolerances;
Welding;
Non-welded joints.
3.3.8. Specification Sheet
A summary of the documents providing the information required in Paragraph 5.1. shall be
listed on a specification sheet for each tank design. The title, reference number, revision
numbers and dates of original issue and version issues of each document shall be given. All
documents shall be signed or initialled by the issuer. The specification sheet shall be given a
number, and revision numbers if applicable, that can be used to designate the tank design and
shall carry the signature of the engineer responsible for the design. Space shall be provided on
the specification sheet for a stamp indicating registration of the design.
3.3.9.1. Additional Supporting Data
Additional data that would support the application, such as the service history of material
proposed for use, or the use of a particular tank design in other service conditions, shall be
provided where applicable.
3.4. Approval and Certification
3.4.1. Inspection and Testing
Evaluation of conformity is required to be performed in accordance with the provisions of
Paragraph 11. of this Regulation;

4.3.1. Composition
The chemical composition of all steels shall be declared and defined at least by carbon,
manganese, silicon, nickel, chromium, and molybdenum contents, and any other alloying
elements intentionally added.
4.3.2. Tensile Test
The tensile properties of welded steel in the inner vessel shall be tested in accordance with EN
895:1995 and EN 6892-1:2009.
4.3.3. Impact Test
The impact properties of welded steel in the inner vessel shall be tested in accordance with EN
1251-2:2000 and EN 10045-1:1990.
4.3.4. Bending Test
The bending properties of welded steel in the inner vessel shall be tested in accordance with
EN 910:1996.
4.3.5. Weld Examination
Radiographic inspection of welded steel in the inner vessel shall be performed in accordance
with EN 1251-2:2000 and EN 1435:1997.
4.4. Test Pressure
The following minimum inner vessel test pressure shall be used in manufacture:
Ptest = 1.3 (WP + 0.1) [MPa]
Where:
WP is in MPa.
4.5. Stress Analysis
A stress analysis shall be performed to justify the minimum design wall thicknesses. A stress
analysis shall be performed to justify the internal support element design when exposed to the
accelerations described in Paragraph 18.4.4. of this Regulation. The stress shall not exceed
the minimum ultimate tensile strength of the material when calculated according with a linear
stress model. The allowable stress in the internal support elements may not have to be
calculated, if it can be demonstrated that the fuel tank supports the accelerations given in
Paragraph 18.4.4. without any structure damage to the inner tank or its supports.
4.6. Inspection and Testing
The manufacturing inspection shall specify programmes and procedures for:
(a)
Manufacturing inspection, tests and acceptance criteria; and

4.12. Failure to Meet Test Requirements
In the event of failure to meet test requirements retesting shall be carried out as follows:
(a)
(b)
If there is evidence of a fault in carrying out a test, or an error of measurement, a further
test shall be performed. If the result of this test is satisfactory, the first test shall be
ignored.
If the test has been carried out in a satisfactory manner, the cause of test failure shall be
identified.
If the failure is found during non-destructive tests, all the identified defective tanks shall be
rejected or repaired by an approved method. The non-rejected tanks are then considered as a
new batch. All the relevant prototype or batch tests need to prove the acceptability of the new
batch and shall be performed again. If one or more tests prove even partially unsatisfactory,
then all tanks of the batch shall be rejected.
4.13. Change of Design
A design change is any change in the selection of structural materials or dimensional change
not attributable to normal manufacturing tolerances.
Minor design changes shall be permitted to be qualified through a reduced test programme.
Changes of design specified in Table 6.4 shall require design qualification testing as specified.
Table 6.1
Material Design Qualification Tests
Inner vessel material
Relevant Paragraph of
this Annex
Tensile test 4.3.2.
Impact test 4.3.3.
Bending test 4.3.4.
Weld examination 4.3.5.
Table 6.2
Tank Design Qualification Tests
Test and Annex reference
Bonfire test Annex 3B, Appendix A. Paragraph A.1
Drop test Annex 3B, Appendix A. Paragraph A.2
Hold-time test Annex 3B, Appendix A. Paragraph A.3

5. MARKINGS
5.1. On each tank, the manufacturer shall provide clear permanent markings not less than 6mm
high. Marking shall be made either by labels attached by adhesive or plates attached by welds.
Adhesive labels and their application shall be in accordance with ISO 7225, or an equivalent
standard. Multiple labels or plates are allowed and should be located such that they are not
obscured by mounting brackets. Each tank complying with this Annex shall be marked as
follows:
(a)
Mandatory information:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
"LNG ONLY";
Manufacturer's identification;
Tank identification (applicable part number and a serial number unique for every
cylinder);
Working pressure and temperature;
Regulation number, along with tank type and certification registration number;
The pressure relief devices and/or valves that are qualified for use with the tank
or the means for obtaining information on qualified fire protection systems;
When labels are used, all tanks shall have a unique identification number
stamped on an exposed metal surface to permit tracing in the event that the
label is destroyed.
(b)
Non-mandatory information:
On a separate label(s) the following non-mandatory information may be provided:
(i)
(ii)
(iii)
Gas temperature range, e.g. -195 °C to 65 °C;
Nominal water capacity of the tank to two significant numbers. e.g. 120 litres;
Date of original pressure test (month and year).
The markings shall be placed in the listed sequence but the specific arrangement may be
varied to match the space available. An acceptable example of mandatory information is:
LNG ONLY
Manufacturer/Part Number/Serial Number
1.6MPa (16bar)/-160°C
ECE R 110 LNG (registration No…)
"Use Only Manufacturer-Approved Pressure Relief Device"

ANNEX 3B – APPENDIX A
TEST METHODS
A.1.
A.1.1.
BONFIRE TEST
General
The bonfire tests are designed to demonstrate that finished tanks complete with the fire
protection system (tank valve, pressure relief valves and/or integral thermal insulation)
specified in the design will not burst when tested under the specified fire conditions. Extreme
caution shall be exercised during fire testing in the event that tank rupture occurs.
A.1.2.
Tank Set-up
The inner tank shall be at the same temperature as the temperature of the LNG. This
requirement shall be deemed met if, during the previous 24h, the fuel tank has contained a
volume of liquid LNG at least equal to half of the volume of the inner tank.
The fuel tank shall be filled with LNG so that the quantity of LNG measured by the mass
measurement system shall be within 10% of the maximum allowed net quantity that may be
contained in the inner tank.
A.1.3.
Fire Source
The length and the width of the fire shall exceed the plan dimensions of the fuel tank by 0.1m.
ISO 11439 contains directions to produce a suitable fire test. The average temperature shall
remain above 590°C for the duration of the test.
Any fuel may be used for the fire source provided it supplies uniform heat sufficient to maintain
the specified test temperatures until the tank is vented. The selection of fuel should take into
consideration air pollution concerns. The arrangement of the fire shall be recorded in sufficient
detail to ensure the rate of heat input to the tank is reproducible. Any failure or inconsistency of
the fire source during a test invalidates the result.
A.1.4.
Temperature and Pressure Measurements
The average temperature of space 10mm below the fuel tank as measured by two or more
thermocouples shall be at least 590°C.
Thermocouple temperatures and the tank pressure shall be recorded at intervals of every 30s
or less during the test.
A.1.5.
General Test Requirements
The pressure of the fuel tank at the beginning of the test shall be within 0.1MPa of the
saturation pressure of LNG in the inner tank.
The lapse of time, from the moment that the average temperature first reaches 590°C until the
opening of the primary pressure relief valve, shall be measured.
Once the pressure relief valve opens, the test shall continue until the blow off of the pressure
relief valve is complete.

ANNEX 3B – APPENDIX B
REPORT FORM
NOTE - This Appendix is not a mandatory part of this Annex.
The following forms should be used:
1. Description and serial number for vessel
2. Certificates of conformity, such as relief valves, manual valves, fill fitting, etc.
3. Radiographic test report - weld seams
4. Mechanical test report - joint tensile test, bending tests, impact tests
5. Material test reports - all steel inner vessel components

C.7.
IN-SERVICE INSPECTION
The manufacturer shall clearly specify the user's obligation to observe the required tank
inspection requirements (e.g. re-inspection interval, by authorized personnel). This information
shall be in agreement with the design approval requirements.

10. Each tank was made in compliance with all requirements of Regulation No. ... in accordance with
the tank description above. Required reports of test results are attached.
11. I hereby certify that all these test results proved satisfactory in every way and are in compliance
with the requirements for the type listed above.
12. Comments: ......................................................................................................................................
13. Competent Authority: ......................................................................................................................
14. Inspector's signature: ......................................................................................................................
15. Manufacturer's signature: ................................................................................................................
16. Place, date: ....................................................................................................................................

2.3. The electrical system, if existing, shall be isolated from the body of the automatic valve.
Isolation resistance shall be >10MΩ.
2.4. The automatic valve activated by an electric current shall be in a "closed" position when the
current is switched off.
2.5. The automatic valve has to comply with the test procedures for the Class component
determined according to the scheme in Figure 1-1 of Paragraph 3 of this Regulation.
3. THE NON-RETURN VALVE
3.1. The materials constituting the non-return valve which are in contact with the CNG when
operating, shall be compatible with the test CNG. In order to verify this compatibility the
procedure described in Annex 5D shall be used.
3.2. Operating Specifications
3.2.1. The non-return valve shall be so designed as to withstand a pressure of 1.5 times the working
pressure (MPa) without leakage and deformation.
3.2.2. The non-return valve shall be so designed as to be leak-proof (external) at a pressure of
1.5 times the working pressure (MPa) (see Annex 5B).
3.2.3. The non-return valve, being in the normal position of use specified by the manufacturer, is
submitted to 20,000 operations; then it is deactivated. The non-return valve shall remain
leak-proof (external) at a pressure of 1.5 times the working pressure (MPa) (see Annex 5B).
3.2.4. The non-return valve shall be so designed to operate at temperatures as specified in
Annex 5O.
3.3. The non-return valve has to comply with the test procedures for the Class component
determined according to the scheme in Figure 1-1 of Paragraph 3 of this Regulation.
4. THE PRESSURE RELIEF VALVE AND PRESSURE RELIEF DEVICE
4.1. The materials constituting the pressure relief valve and pressure relief device which are in
contact with the CNG when operating, shall be compatible with the test CNG. In order to verify
this compatibility, the procedure described in Annex 5D shall be used.
4.2. Operating Specifications
4.2.1. The pressure relief valve and pressure relief device in Class 0 shall be so designed as to
withstand a pressure of 1.5 times the working pressure (MPa).
4.2.2. The pressure relief valve and pressure relief device in Class 6 shall be so designed as to
withstand a pressure of 1.5 times the working pressure (MPa) with the outlet closed off.
4.2.3. The pressure relief valve and pressure relief device of Class 1 shall be so designed as to be
leak-proof at a pressure of 1.5 times the working pressure (MPa) with the outlet closed off (see
Annex 5B).
4.2.4. The pressure relief valve of Class 2 shall be so designed as to be leak-proof at twice the
working pressure with the outlets closed off.

6.4. The manual valve device in Class 6 shall be designed to operate at temperatures as specified
in Annex 5O.
6.5. Manual Valve Device Requirements
One specimen shall be submitted to a fatigue test at a pressure cycling rate not to exceed
4 cycles per minute as follows: held at 20°C while pressured for 2,000 cycles between 2MPa
and 26MPa (for Class 0) or between 2MPa and declared working pressure (for Class 6).
7. PRESSURE RELIEF DEVICE (PRESSURE TRIGGERED)
7.1. The materials constituting the PRD (pressure triggered) which are in contact with the CNG
when operating, shall be compatible with the test CNG. In order to verify this compatibility, the
procedure described in Annex 5D shall be used.
7.2. Operating Specifications
7.2.1. The PRD (pressure triggered) of Class 0, shall be so designed to operate at temperatures as
specified in the Annex 5O.
7.2.2. The burst pressure of the PRD (pressure triggered) of Class 0 shall be 34MPa ± 10% at
ambient temperature and at the maximum operating temperature as indicated in Annex 5O.
7.2.3. The PRD (pressure triggered) of Class 6, shall be so designed to operate at temperatures as
specified in the Annex 5O.
7.2.4. The burst pressure of the PRD (pressure triggered) of Class 6 shall be at least 1.5 times
working pressure at ambient temperature and at the maximum operating temperature as
indicated in Annex 5O.
7.3. The device has to comply with the test procedures for the Class components, specified in the
scheme in Figure 1-1 of Paragraph 3. of this Regulation, except overpressure, internal leakage
and external leakage.
7.4. PRD (Pressure Triggered) Requirements
7.4.1. Continued Operation
7.4.1.1. Test Procedure
Cycle the PRD (pressure triggered) according to Table 3, with water between 10% and 100%
of the working pressure, at a maximum cyclic rate of 10 cycles per minute and a temperature
of 82°C ± 2°C or 57°C ± 2°C.
Temperature [°C]
Table 3
Test Temperatures and Cycles
Cycles
82 2,000
57 18,000

ANNEX 4B
PROVISIONS ON THE APPROVAL OF FLEXIBLE FUEL LINES OR HOSES FOR CNG AND HOSES
FOR LNG
0. The purpose of this Annex is to determine the provisions regarding the approval of flexible
hoses for use with CNG or LNG.
This Annex covers three types of CNG flexible hoses (a), (b), (c) and one type of LNG hose (d):
(a) High pressure hoses (Class 0, Class 6),
(b) Medium pressure hoses (Class 1),
(c) Low pressure hoses (Class 2)
(d) LNG hoses (Class 5)
1. HIGH PRESSURE HOSES, CLASS 0 AND CLASS 6 CLASSIFICATION
1.1. General Specifications
1.1.1. The hose shall be so designed as to withstand a maximum working pressure of 1.5 times the
working pressure (MPa).
1.1.2. The hose shall be so designed as to withstand temperatures as specified in Annex 5O.
1.1.3. The inside diameter shall be in compliance with Table 1 of Standard ISO 1307.
1.2. Hose Construction
1.2.1. The hose shall embody a smooth-bore tube and a cover of suitable synthetic material,
reinforced with one or more interlayer(s).
1.2.2. The reinforcing interlayer(s) has (have) to be protected by a cover against corrosion.
If for the reinforcing interlayer(s) corrosion-resistant-material is used (i.e. stainless-steel) a
cover is not required.
1.2.3. The lining and the cover shall be smooth and free from pores, holes and strange elements.
An intentionally provided puncture in the cover shall not be considered as an imperfection.
1.2.4. The cover has to be intentionally perforated to avoid the forming of bubbles.
1.2.5. When the cover is punctured and the interlayer is made of a non-corrosion-resistant material,
the interlayer has to be protected against corrosion.

1.3.2. Tensile strength and elongation specific for thermoplastic material.
1.3.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
specimen type: Type 1 BA.
tensile speed: 20mm/min.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
tensile strength not less than 20MPa.
(b) elongation at break not less than 100%.
1.3.2.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
1.3.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 1.3.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.

1.4.2. Tensile strength and elongation specific for thermoplastic material.
1.4.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
specimen type: Type 1 BA.
tensile speed: 20mm/min.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
tensile strength not less than 20MPa.
(b) elongation at break not less than 100%.
1.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
medium: n-hexane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
1.4.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 1.4.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 20% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 50% after 336h ageing compared to the
elongation at break of the 24h aged material.

1.5.3.2.
Figure 1
(Example Only)
Hose inside
diameter
[mm]
Bending radius
[mm]
(Figure 1)
Distance between centres [mm]
(Figure 1)
Vertical
b
Horizontal
a
up to 13 102 241 102
13 to 16 153 356 153
from 16 to 20 178 419 178
1.5.3.3. The testing-machine (Figure 1) shall consist of a steel frame, provided with two wooden
wheels, with a rim-width of approximately 130mm.
The circumference of the wheels shall be grooved for the guidance of the hose.
The radius of the wheels, measured to the bottom of the groove, shall be as indicated in
Paragraph 1.5.3.2. above.
The longitudinal median planes of both wheels shall be in the same vertical plane and the
distance between the wheel-centres shall be in accordance with Paragraph 1.5.3.2. above.
Each wheel shall be able to rotate freely round its pivot-centre.
A propulsion-mechanism pulls the hose over the wheels at a speed of four complete motions
per minute.

1.7.2.2. The hose has to be subjected to 150,000 impulses.
1.7.2.3. After the impulse-test the hose has to withstand the test-pressure as mentioned in
Paragraph 1.5.4.2. above.
1.7.3. Gas-tightness
1.7.3.1. The hose assembly (hose with couplings) has to withstand during 5min a gas pressure of 1.5
times the working pressure (MPa) without any leakage.
1.8. Markings
1.8.1. Every hose shall bear, at intervals of not greater than 0.5m, the following clearly legible and
indelible identification markings consisting of characters, figures or symbols.
1.8.1.1. The trade name or mark of the manufacturer.
1.8.1.2. The year and month of fabrication.
1.8.1.3. The size and type-marking.
1.8.1.4. For Class 0, the identification-marking "CNG Class 0", for Class 6 the identification-marking
"CNG Class 6".
1.8.2. Every coupling shall bear the trade name or mark of the assembling manufacturer.
2. MEDIUM PRESSURE HOSES, CLASS 1 CLASSIFICATION
2.1. General Specifications
2.1.1. The hose shall be so designed as to withstand a maximum working pressure of 3MPa.
2.1.2. The hose shall be so designed as to withstand temperatures as specified in Annex 5O.
2.1.3. The inside diameter shall be in compliance with Table 1 of Standard ISO 1307.
2.2. Hose Construction
2.2.1. The hose shall embody a smooth-bore tube and a cover of suitable synthetic material,
reinforced with one or more interlayer(s).
2.2.2. The reinforcing interlayer(s) has (have) to be protected by a cover against corrosion.
If for the reinforcing interlayer(s) corrosion-resistant-material is used (i.e. stainless-steel) a
cover is not required.
2.2.3. The lining and the cover shall be smooth and free from pores, holes and strange elements.
An intentionally provided puncture in the cover shall not be considered as an imperfection.

2.3.2. Tensile strength and elongation specific for thermoplastic material.
2.3.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
specimen type: Type 1BA.
tensile speed: 20mm/min.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirement:
(a)
tensile strength not less than 20MPa.
(b) elongation at break not less than 100%.
2.3.2.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
2.3.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 2.3.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.

2.4.2. Tensile strength and elongation specific for thermoplastic material.
2.4.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
specimen type: Type 1BA.
tensile speed: 20mm/min.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
tensile strength not less than 20MPa.
(b) elongation at break not less than 100%.
2.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
medium: n-hexane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
2.4.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 2.4.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 20% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 50% after 336h ageing compared to the
elongation at break of the 24h aged material.

2.5.3.2.
Hose inside
diameter
[mm]
Bending radius
[mm]
(Figure 2)
Figure 2
(Example Only)
Distance between centres [mm]
(Figure 2)
Vertical
b
Horizontal
a
up to 13 102 241 102
13 to 16 153 356 153
from 16 to 20 178 419 178
2.5.3.3. The testing-machine (Figure 2) shall consist of a steel frame, provided with two wooden
wheels, with a rim-width of approximately 130mm.
The circumference of the wheels shall be grooved for the guidance of the hose.
The radius of the wheels, measured to the bottom of the groove, shall be as indicated in
Paragraph 2.5.3.2. above.
The longitudinal median planes of both wheels shall be in the same vertical plane and the
distance between the wheel-centres shall be in accordance with Paragraph 2.5.3.2. above.
Each wheel shall be able to rotate freely round its pivot-centre.
A propulsion-mechanism pulls the hose over the wheels at a speed of four complete motions
per minute.

2.8. Markings
2.8.1. Every hose shall bear, at intervals of not greater than 0.5m, the following clearly legible and
indelible identification markings consisting of characters, figures or symbols.
2.8.1.1. The trade name or mark of the manufacturer.
2.8.1.2. The year and month of fabrication.
2.8.1.3. The size and type marking.
2.8.1.4. The identification-marking "CNG. Class 1".
2.8.2. Every coupling shall bear the trade name or mark of the assembling manufacturer.
3. LOW PRESSURE HOSES, CLASS 2 CLASSIFICATION
3.1. General specifications
3.1.1. The hose shall be so designed as to withstand a maximum working pressure of 450kPa.
3.1.2. The hose shall be so designed as to withstand temperatures as specified in Annex 5O.
3.1.3. The inside diameter shall be in compliance with Table 1 of Standard ISO 1307.
3.2. (Not Allocated)
3.3. Specifications and Tests for the Lining
3.3.1. Tensile strength and elongation for rubber material and for thermoplastic elastomers (TPE)
3.3.1.1. Tensile strength and elongation at break according to ISO 37
Tensile strength not less than 10MPa and elongation at break not less than 250%.

3.3.2.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
3.3.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 3.3.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
3.4. Specifications and Test-Method for the Cover
3.4.1. Tensile strength and elongation for rubber material and for thermoplastic elastomers (TPE)
3.4.1.1. Tensile strength and elongation at break according to ISO 37
Tensile strength not less than 10MPa and elongation at break not less than 250%.

3.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
medium: n-hexane.
(b) temperature: 23°C (tolerance according to ISO 1817).
(c)
immersion period: 72hr.
Requirements:
(a) maximum change in volume 2%.
(b) maximum change in tensile strength 10%.
(c) maximum change in elongation at break 10%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
3.4.2.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
temperature: 115°C (test temperature = maximum operating temperature -10°C).
exposure period: 24 and 336hr.
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 3.4.2.1. above.
Requirements:
(a)
(b)
maximum change in tensile strength 20% after 336h ageing compared to the tensile
strength of the 24h aged material.
maximum change in elongation at break 50% after 336h ageing compared to the
elongation at break of the 24h aged material.
3.4.3. Resistance to Ozone
3.4.3.1. The test has to be performed in compliance with Standard ISO 1431/1.
3.4.3.2. The test-pieces, which have to be stretched to an elongation of 20% shall have to be exposed
to air of 40°C and a relative humidity of 50% ± 10% with an ozone concentration of 50 parts per
hundred million during 120hr.
3.4.3.3. No cracking of the test pieces is allowed.

3.5.4. Bending Test
3.5.4.1. An empty hose, at a length of approximately 3.5m shall be able to withstand 3,000 times the
hereafter prescribed alternating-bending-test without breaking.
3.5.4.2.
Figure 3
(Example Only)
The testing machine (Figure 3) shall consist of a steel frame, provided with two wooden
wheels, with a rim width of approx. 130mm.
The circumference of the wheels shall be grooved for the guidance of the hose.
The radius of the wheels, measured to the bottom of the groove, shall be 102mm.
The longitudinal median planes of both wheels shall be in the same vertical plane. The distance
between the wheel-centres shall be vertical 241mm and horizontal 102mm.
Each wheel shall be able to rotate freely round its pivot-centre.
A propulsion-mechanism pulls the hose over the wheels at a speed of four complete motions
per minute.
3.5.4.3. The hose shall be S-shape-like installed over the wheels (see Figure 3).
The end, that runs over the upper wheel, shall be furnished with a sufficient mass as to achieve
a complete snuggling of the hose against the wheels. The part that runs over the lower wheel is
attached to the propulsion mechanism.
The mechanism shall be so adjusted, that the hose travels a total distance of 1.2m in both
directions.

4.3.1.2. Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
Medium: n-pentane;
(b) Temperature: 23°C (tolerance according to ISO 1817);
(c) Immersion period: 72h.
Requirements:
(a) Maximum change in volume 20%;
(b) Maximum change in tensile strength 25%;
(c) Maximum change in elongation at break 30%.
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.
4.3.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
(b)
Temperature: 115°C (test temperature = maximum operating temperature -10°C);
Exposure period: 24 and 336h
After ageing the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 4.3.1.1. of this Annex.
Requirements:
(a)
(b)
Maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material;
Maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
4.3.2. Tensile strength and elongation specific for thermoplastic material.
4.3.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
Specimen type: type 1BA;
Tensile speed: 20mm/m.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
Tensile strength not less than 20MPa;
(b) Elongation at break not less than 100%.

Requirements:
(a) Maximum change in volume 30%;
(b) Maximum change in tensile strength 35%;
(c) Maximum change in elongation at break 35%.
4.4.1.3. Resistance to ageing according to ISO 188 with the following conditions:
(a)
Temperature: 115°C (test temperature = maximum operating temperature -10°C);
(b) Exposure period: 24 and 336h.
After ageing, the specimens have to be conditioned at 23°C and 50% relative humidity for at
least 21 days prior to carrying out the tensile test according to Paragraph 4.4.1.1. of this Annex.
Requirements:
(a)
(b)
Maximum change in tensile strength 35% after 336h ageing compared to the tensile
strength of the 24h aged material;
Maximum change in elongation at break 25% after 336h ageing compared to the
elongation at break of the 24h aged material.
4.4.2. Tensile strength and elongation specific for thermoplastic material.
4.4.2.1. Tensile strength and elongation at break according to ISO 527-2 with the following conditions:
(a)
(b)
Specimen type: type 1BA;
Tensile speed: 20mm/minute.
The material has to be conditioned for at least 21 days at 23°C and 50% relative humidity prior
to testing.
Requirements:
(a)
Tensile strength not less than 20MPa;
(b) Elongation at break not less than 100%.
4.4.2.2. Resistance to n-hexane according to ISO 1817 with the following conditions:
(a)
Medium: n-hexane;
(b) Temperature: 23°C (tolerance according to ISO 1817);
(c) Immersion period: 72h.

4.5.2.2. Test temperature: -163°C (equivalent can be found in the table of Annex 5O)
4.5.2.3. No cracking or rupture is allowed.
4.5.3. Bending Test
4.5.3.1. The test has to be carried out in compliance with the method described in standard
ISO15500-17:2012
4.5.4. Hydraulic Test Pressure and Appointment of the Minimum Burst-Pressure
4.5.4.1. The test has to be carried out in compliance with the method described in standard ISO 1402.
Test temperature: -163°C (equivalent can be found in the table of Annex 5O)
4.5.4.2. The test pressure of 1.5 times the manufacture declared working pressure (MPa) shall be
applied during 10min, without any leakage.
4.5.4.3. The burst pressure shall not be less than 2.25 times the manufacture declared working
pressure (MPa).
4.5.5 Pull Off
4.5.5.1 The test has to be carried out in compliance with the method described in standard ISO15500-
17:2012.
4.5.6. Electrical Conductivity
4.5.6.1. The test has to be carried out in compliance with the method described in standard
ISO15500-17:2012.
4.5.7. Vibration
4.5.7.1. Mount one end of the test assembly on the static support and the other end on the vibration
head, making sure that the tubing is bent at the minimum bending radius of 180° preventing the
hose to kink.
Using cryogenic fluid, pressurize the test sample at the manufacture declared working
pressure.
Test temperature: -163°C (equivalent can be found in the table of Annex 5O).
Vibrate the component for 30min, pressurized, and sealed at the downstream side along each
of the three orthogonal axes at the most severe resonant frequency determined as follows:
(a)
(b)
(c)
By an acceleration of 1.5g;
Within a sinusoidal frequency range of 10Hz to 500Hz;
With a sweep time of 10min.
If the resonance frequency is not found in this range, the test shall be conducted at 500Hz.

ANNEX 4C
PROVISIONS ON THE APPROVAL OF THE CNG FILTER
1. The purpose of this Annex is to determine the provisions ON the approval of the CNG filter.
2. OPERATING CONDITIONS
2.1. The CNG filter shall be so designed to operate at temperatures as specified in Annex 5O.
2.2. CNG filter shall be Classified with regard to the maximum working pressure (see Figure 1-1
Paragraph 3. of this Regulation):
2.2.1. Class 0: The CNG filter shall be so designed to withstand a pressure of 1.5 times the working
pressure (MPa).
2.2.2. Class 6: The CNG filter shall be so designed to withstand a pressure of 1.5 times the working
pressure (MPa).
2.2.3. Class 1 and Class 2: The CNG filter shall be so designed to withstand a pressure twice the
working pressure.
2.2.4. Class 3: the CNG filter shall be so designed to withstand a pressure twice the relief pressure of
the pressure relief valve on which it is subject.
2.3. The materials used in the CNG filter which are in contact with CNG when operating, shall be
compatible with this gas (see Annex 5D).
2.4. The component has to comply with the test procedures for Class components according to the
scheme in Figure 1-1 of Paragraph 3. of this Regulation.

3. CLASSIFICATION AND TEST PRESSURES
3.1. The part of the pressure regulator which is in contact with the pressure of the container is
regarded as Class 0.
3.1.1. The Class 0 part of the pressure regulator shall be leak-proof (see Annex 5B) at a pressure up
to 1.5 times the working pressure (MPa) with the outlet(s) of that part closed off.
3.1.2. The Class 0 part of the pressure regulator shall withstand a pressure up to 1.5 times the
working pressure (MPa).
3.1.3. The Class 1 and Class 2 part of the CNG pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to twice the working pressure.
3.1.4. The Class 1 and Class 2 part of the CNG pressure regulator shall withstand a pressure up to
twice the working pressure.
3.1.5. The Class 3 part of the CNG pressure regulator shall withstand a pressure up to twice the relief
pressure of the pressure relief valve, on which it is subject.
3.2. The part of the pressure regulator which is in contact with pressure higher than 26MPa is
regarded as Class 6.
3.2.1. The Class 6 part of the pressure regulator shall be leak-proof (see Annex 5B) at a pressure up
to 1.5 times the working pressure (MPa) with the outlet(s) of that part closed off.
3.2.2. The Class 6 part of the pressure regulator shall withstand a pressure up to 1.5 times the
working pressure (MPa).
3.2.3. The part of the pressure regulator that is in contact with pressure below 26MPa is classified as
per Part I, Section 3, of this Regulation.
3.2.3.1. The Class 0 part of the pressure regulator shall be leak-proof (see Annex 5B) at a pressure up
to 1.5 times the working pressure (MPa) with the outlet(s) of that part closed off.
3.2.3.2. The Class 0 part of the pressure regulator shall withstand a pressure up to 1.5 times the
working pressure (MPa).
3.2.3.3. The Class 1 and Class 2 part of the CNG pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to twice the working pressure.
3.2.3.4. The Class 1 and Class 2 part of the CNG pressure regulator shall withstand a pressure up to
twice the working pressure.
3.2.3.5. The Class 3 part of the CNG pressure regulator shall withstand a pressure up to twice the relief
pressure of the pressure relief valve, on which it is subject.
3.3. The pressure regulator shall be so designed to operate at temperatures as specified in
Annex 5O.

ANNEX 4F
PROVISIONS REGARDING THE APPROVAL OF THE CNG FILLING UNIT
(RECEPTACLE)
1. The purpose of this Annex is to determine the provisions regarding the approval of the CNG
filling unit.
2. THE CNG FILLING UNIT
2.1. The CNG filling unit shall comply with the requirements laid down in Paragraph 3. below and
shall have the dimensions of Paragraph 4. below.
2.2. CNG filling units designed in accordance with ISO 14469-1 first edition 2004-11-01 or
ISO 14469-2 : 2007 and meeting all the requirements therein are deemed to fulfil the
requirements of Paragraphs 3. and 4. of this Annex.
3. THE CNG FILLING UNIT TEST PROCEDURES
3.1. The CNG filling unit shall conform to the requirements of Class 0 and follow the test procedures
in Annex 5 with the following specific requirements.
3.2. The material constituting the CNG filling unit which is in contact with the CNG when the device
is in service shall be compatible with the CNG. In order to verify this compatibility, the
procedure of Annex 5D shall be used.
3.3. The CNG filling unit shall be free from leakage at a pressure of 1.5 times the working pressure
(MPa) (see Annex 5B).
3.4. The CNG filling unit shall withstand a pressure of 33MPa.
3.5. The CNG filling unit shall be so designed to operate at temperatures as specified in Annex 5O.
3.6. The CNG filling unit shall withstand a number of 10,000 cycles in the durability test specified in
Annex 5L.
4. CNG FILLING UNIT DIMENSIONS
4.1. Figure 1 shows the dimensions of the filling unit for vehicles of Categories M and N .
4.2. Figure 2 shows the dimensions of the filling unit for vehicles of Categories M , M , N and N .

Figure 2
20MPa Filling Unit Size 2 (receptacle) for M , M , N and N Vehicles

3.3. Test Pressures
3.3.1. The CNG gas flow adjuster of Class 2 shall withstand a pressure twice the working pressure.
3.3.1.1. The CNG gas flow adjuster of Class 2 shall be free from leakage at a pressure twice the
working pressure.
3.3.2. The CNG gas flow adjuster of Class 1 and Class 2 shall be so designed to operate at
temperatures as specified in Annex 5O.
3.4. Electrical operated components containing CNG shall comply with the following:
(a)
(b)
They shall have a separate ground connection;
The electrical system of the component shall be isolated from the body.

ANNEX 4I
PROVISIONS ON THE APPROVAL OF THE LNG HEAT EXCHANGER – VAPORIZER
1. The purpose of this Annex is to determine the provisions on the approval of the LNG heat
exchanger – vaporizer.
2. LNG HEAT EXCHANGER – VAPORIZER
2.1. The LNG heat exchanger – vaporizer can be any device made for vaporizing the cryogenic
liquid fuel and deliver it as gas to the engine with gas temperature between -40°C and +105°C.
2.2. The material constituting the LNG heat exchanger - vaporizer which is in contact with the CNG
when operating shall be compatible with the test CNG. In order to verify this compatibility, the
procedure in Annex 5D shall be used.
2.3. The part of the LNG heat exchanger - vaporizer which is in contact with the tank is regarded as
Class 5.
2.4. The LNG heat exchanger – vaporizer shall be so designed as to withstand a pressure of 1.5
times the working pressure (MPa) without leakage and deformation.
2.5. The LNG heat exchanger – vaporizer shall be so designed as to be leak-proof (external) at a
pressure of 1.5 times the working pressure (MPa) (see Annex 5B).
2.6. The LNG heat exchanger – vaporizer shall be so designed to operate at temperatures as
specified in Annex 5O.
2.7. The LNG heat exchanger – vaporizer has to comply with the test procedures for the Class 5.
2.8. The LNG heat exchanger – vaporizer has to comply with the water jacket freezing test. Fill the
part of the heat exchanger-vaporizer which normally contains an antifreeze solution, with water
to normal capacity and expose it at -40°C for 24H. Attach 1m sections of coolant hose to the
coolant inlet and outlet of the heat exchanger – vaporizer. Following the freezing conditioning,
conduct an external leakage test according to Annex 5B at room temperature. A separate
sample may be used for this test.

3.1.4.3. High Temperature Cycling
The component shall be operated through 2% of the total cycles as above at the appropriate
maximum temperature specified at rated service pressure. The component shall comply with
the leakage test of Annex 5B at the high temperature at the completion of the high temperature
cycles.
Following cycling and leakage re-test, the component shall be capable of removal of the filling
nozzle without spilling more than 30cm LNG.
3.1.5. The LNG filling receptacle shall be made out of non-sparking material and should comply with
the no igniting evaluation tests described in ISO 14469-1:2004.
3.1.6. The electrical resistance of the connected LNG filling receptacle and nozzle shall not be greater
than 10Ω either in the pressurized and un-pressurized state. Test shall be conducted prior to
and after the endurance test.
4. LNG FILLING RECEPTACLE DIMENSIONS
4.1. Figure 1 shows the dimensions of the LNG filling receptacle.
Figure 1
Dimensions of the Receptacle

ANNEX 4L
PROVISIONS ON THE APPROVAL OF LNG PRESSURE AND/OR TEMPERATURE SENSOR
1. The purpose of this Annex is to determine the provisions on the approval of the LNG pressure
and/or temperature sensor.
2. LNG PRESSURE AND TEMPERATURE SENSORS.
2.1. The LNG pressure and temperature sensors are classified in Class 5 according to the
Scheme 1-1 in Paragraph 3. of this Regulation.
3. The LNG pressure and/or temperature sensor test procedures.
3.1 The LNG pressure and/or temperature sensor test procedures shall conform to the
requirements of Class 5 and follow the test procedures in Annex 5 with the following specific
requirements.
3.2. Insulation Resistance Test.
This test is designed to check for a potential failure of the insulation between the LNG pressure
and/or temperature sensor connection pins and the housing.
Apply 1,000V DC between one of the connector pins and the housing of the LNG pressure
and/or temperature sensor for at least 2s. The minimum allowable resistance shall be >10MΩ.
3.3. The material constituting the LNG pressure and temperature sensors which are in contact with
the LNG when operating shall be compatible with the test LNG. In order to verify this
compatibility, the procedure in Annex 5D shall be used.
3.4. The LNG pressure and/or temperature sensor shall be so designed as to operate at
temperatures as specified in Annex 5O.
3.5. The Class 5 part of the LNG pressure and temperature sensors shall withstand a pressure up
to 1.5 times the working pressure (MPa), at the temperature corresponding to rated service
pressure from the table in Annex 5O, at room temperature and at the maximum temperature
from Annex 5O.

ANNEX 4N
PROVISIONS ON THE APPROVAL OF THE AUTOMATIC VALVE, CHECK VALVE, PRESSURE
RELIEF VALVE, EXCESS FLOW VALVE, MANUAL VALVE AND NON-RETURN VALVE
FOR LNG APPLICATIONS.
1. The purpose of this Annex is to determine the provisions on the approval of the automatic
valve, the check valve, the pressure relief valve and the excess flow valve only for LNG
applications.
2. THE LNG AUTOMATIC VALVE
2.1. The materials constituting the LNG automatic valve, which are in contact with the LNG when
operating, shall be compatible with the test LNG. In order to verify this compatibility the
procedure described in Annex 5D shall be used.
2.2. Operating Specifications
2.2.1. The LNG automatic valve shall be so designed as to withstand a pressure of 1.5 times the
working pressure (MPa) without leakage or deformation (see Annex 5A).
2.2.2. The LNG automatic valve shall be so designed as to be leak-proof at a pressure of 1.5 times
the working pressure (MPa) (see Annex 5B).
2.2.3. The LNG automatic valve, being in the normal position of use specified by the manufacturer, is
submitted to 7,000 operations; then it is deactivated. The automatic valve shall remain leakproof
according to Annex 5B and 5C at a pressure of 1.5 times the working pressure. This test
is performed for 96% of its cycles at cryogenic temperatures, 2% at ambient temperature and
2% at high temperature according to the table in Annex 5O.
2.2.4. The LNG automatic valve shall be so designed to operate at temperatures as specified in
Annex 5O.
2.2.5. The Insulation Resistance Test.
This test is designed to check for a potential failure of the insulation between the two-pin coil
assembly and the LNG automatic valve casing.
Apply 1,000V DC between one of the connector pins and the housing of the automatic valve for
at least 2s. The minimum allowable resistance shall be 10MΩ.
3. THE LNG CHECK VALVE
3.1. The materials constituting the LNG check valve which are in contact with the LNG when
operating, shall be compatible with the test LNG. In order to verify this compatibility the
procedure described in Annex 5D shall be used.
3.2. Operating Specifications
3.2.1. The LNG check valve shall be so designed as to withstand a pressure of 1.5 times the working
pressure (MPa) without leakage and deformation at cryogenic temperature.

5.4. An excess flow valve shall operate at not more than 10% above, nor less than 20% below the
rated closing mass flow capacity specified by the manufacturer.
5.4.1. Three samples of each size and style of valve are to be subjected to these tests. The LNG
valve intended for use only with liquid is to be tested with water. Except as indicated in
Paragraph 5.4.3. below, separate tests are to be run with each sample installed in vertical,
horizontal and inverted positions.
5.4.2. The test with water is to be conducted using a liquid flow meter (or equivalent) installed in a
piping system having sufficient pressure to provide the required flow.
The system is to include an inlet piezometer or pipe at least one pipe size larger than the valve
to be tested, with a flow control valve connected between the flow meter and piezometer. A
hose or hydrostatic relief valve, or both, may be used to reduce the effect of the pressure shock
when the excess flow valve closes.
5.4.3. A valve intended for installation in one position only may be tested only in that position.
5.5. When the LNG excess flow valve is at cut-off position, the by-pass flow through the valve shall
not exceed an airflow rate declared by the manufacturer in cm3/minute at service pressure.
5.6. The device shall comply with the test procedures for the Class 5 components.
6. THE LNG MANUAL VALVE
6.1. The materials constituting the LNG manual valve which are in contact with the LNG when
operating, shall be compatible with the test LNG. In order to verify this compatibility, the
procedure described in Annex 5D shall be used.
6.2. Operating Specifications
6.2.1. The LNG manual valve device in Class 5 shall be designed to withstand a pressure of 1.5 times
the working pressure at cryogenic temperature.
6.2.2. The LNG manual valve device in Class 5 shall be designed to operate at a temperature from -
162°C to 85°C.
6.3. LNG Manual Valve Device Requirements
One specimen shall be submitted to a fatigue test at a pressure-cycling rate not to exceed 4
cycles a minute as follows:
Held at -162°C or lower while pressured for 100 cycles between 0 and working pressure WP.
The maximum torque on the valve shall than comply with 2 times the force mentioned in
Table 5.3 in Annex 5L. After the test the
LNG manual valve shall comply with the external leak test in Annex 5B. If during this test icing
occurs, the LNG manual valve may be de-iced and dried.
6.4. The LNG manual valve has to comply with the test procedures for the Class 5 component.

3. APPLICABLE TEST PROCEDURES:
3.1. LNG Fuel Pump Mounted Inside the Tank:
LNG compatibility test
Resistance to dry heat
Ozone ageing
Low temperature test
Annex 5D
Annex 5F
Annex 5G
Annex 5P
3.2. LNG Fuel Pump Mounted Outside the Tank:
Overpressure or strength
External leakage
LNG compatibility
Corrosion resistance
Resistance to dry heat
Ozone ageing
Temperature cycle
Vibration resistance
Low temperature test
Annex 5A
Annex 5B
Annex 5D
Annex 5E
Annex 5F
Annex 5G
Annex 5H
Annex 5N
Annex 5P

Remarks:
(a)
(b)
(c)
(d)
(e)
Internal leakage: Applicable if the Class of the component consists of internal valve seats
that are normally closed during engine "OFF" condition.
Durability test: Applicable if the Class of the component consists of integral parts that will
move repeatedly during engine operation.
CNG compatibility, resistance to dry heat, ozone ageing: Applicable if the class of the
component consists of synthetic/non-metallic parts.
Temperature cyclic test: Applicable if the class of the component consists of
synthetic/non-metallic parts.
Vibration resistance test: Applicable if the Class of the component consists of integral
parts that will move repeatedly during engine operation.
The materials used for the components shall have written specifications that fulfil at least or
exceed the (test) requirements laid down in this Annex with respect to:
(a)
(b)
(c)
(d)
temperature
pressure
CNG/LNG compatibility
durability
3. GENERAL REQUIREMENTS
3.1. Leakage tests shall have to be conducted with pressurised gas like air or nitrogen for CNG. For
LNG, cryogenic fluid shall be used.
3.2. Water or another fluid may be used to obtain the required pressure for the hydrostatic strength
test.
3.3. The test period for leakage test and the hydrostatic strength-tests shall be not less than 3min.

ANNEX 5B
EXTERNAL LEAKAGE TEST
1. A component shall be free from leakage through stem or body seals or other joints, and shall
not show evidence of porosity in casting when tested as described in Paragraphs 2. and 3. of
this Annex at any aerostatic pressure between 0 and the pressure shown in Table 5.2 of
Annex 5A.
2. The test shall be performed at the following conditions:
(a)
(b)
(c)
at room temperature
at the minimum operating temperature
at the maximum operating temperature
The maximum and minimum operating temperatures are given in Annex 5O.
3. FOR CNG
During this test the equipment under test (EUT) will be connected to a source of aerostatic
pressure. An automatic valve and a pressure gauge having a pressure range of not less than
1.5 times nor more than 2 times the test pressure are to be installed in the pressure supply
piping. The pressure gauge is to be installed between the automatic valve and the sample
under test. While under the applied test pressure, the sample should be submerged in water to
detect leakage or any other equivalent test method (flow measurement or pressure drop).
3.1. For LNG
During this test the inlet of the component is connected to a source of cryogenic fluid according
to the table in Annex 5O or lower temperature with the working pressure as declared by the
manufacture. The flow is maintained for 0.5h.
4. The external leakage shall be lower than the requirements stated in the annexes or if no
requirements are mentioned the external leakage shall be lower than 15cm /h.
5. HIGH TEMPERATURE TEST
For CNG
A CNG containing component shall not leak more than 15cm /h with the outlet plugged when
submitted to a gas pressure, at maximum operating temperature as indicated in Annex 5O,
equal to the maximum working pressure. The component shall be conditioned for at least 8h at
this temperature.
5.1 For LNG
A LNG containing component shall not leak more than 15cm /h with the flow mentioned in
Paragraph 3.1. in place when submitted to an outside temperature at the maximum operating
temperatures mentioned in Annex 5O.

ANNEX 5C
INTERNAL LEAKAGE TEST
1. The following tests are to be conducted on samples of valves or filling unit which have
previously been subjected to the external leak test of Annex 5B above.
2. The seat of the valves, when in the closed position, shall be free from leakage at any aerostatic
pressure between 0 to 1.5 times the working pressure (kPa). For LNG components, the
temperature used is the cryogenic temperature (see Annex 5O).
3. A CNG non-return valve provided with a resilient seat (elastic), when in the closed position,
shall not leak when subjected to any aerostatic pressure between 0 and 1.5 times the working
pressure (kPa).
4. A CNG non-return valve provided with a metal-to-metal seat, when in the closed position, shall
not leak at a rate exceeding 0.47dm /s when subjected to an aerostatic pressure difference of
138kPa effective pressure.
5. The seat of the upper CNG non-return valve used in the assembly of a filling unit, when in the
closed position, shall be free from leakage at any aerostatic pressure between 0 and 1.5 times
the working pressure (kPa).
6. The internal leakage tests are conducted with the inlet of the sample valve connected to a
source of aerostatic pressure, the valve in the closed position, and with the outlet open. An
automatic valve and a pressure gauge having a pressure range of not less than 1.5 times nor
more than 2 times the test pressure are to be installed in the pressure supply piping. The
pressure gauge is to be installed between the automatic valve and the sample under test.
While under the applied test pressure, observations for leakage are to be made with the open
outlet submerged in water unless otherwise indicated.
7. Compliance with Paragraphs 2. to 5. above is to be determined by connecting a length of
tubing to the valve outlet. The open end of this outlet tube is to be located within an inverted
graduated cylinder which is calibrated in cubic centimetres. The inverted cylinder is to be
closed by a water tight seal. The apparatus is to be adjusted so that:
(a)
(b)
the end of the outlet tube is located approximately 13mm above the water level within the
inverted graduated cylinder, and
the water within and exterior to the graduated cylinder is at the same level. With these
adjustments made, the water level within the graduated cylinder is to be recorded. With
the valve in the closed position assumed as the result of normal operation, air or nitrogen
at the specified test pressure is to be applied to the valve inlet for a test period of not less
than 2min. During this time, the vertical position of the graduated cylinder is to be
adjusted, if necessary, to maintain the same water level within and exterior to it.

ANNEX 5D
CNG/LNG COMPATIBILITY TEST
1. A synthetic part in contact with CNG/LNG shall not show excessive volume change or loss of
weight.
Resistance to n-pentane according to ISO 1817 with the following conditions:
(a)
medium: n-pentane
(b) temperature: 23°C (tolerance according to ISO 1817)
(c)
immersion period: 72hr
2. Requirements:
maximum change in volume 20%
After storage in air with a temperature of 40°C for a period of 48h the mass compared to the
original value may not decrease more than 5%.

ANNEX 5F
RESISTANCE TO DRY-HEAT
1. The test has to be done in compliance with ISO 188. The test piece has to be exposed to air at
a temperature equal to the maximum operating temperature for 168h.
2. The allowable change in tensile strength should not exceed +25%. The allowable change in
ultimate elongation shall not exceed the following values:
(a) Maximum increase 10%
(b) Maximum decrease 30%

ANNEX 5H
TEMPERATURE CYCLE TEST
A non metallic part containing CNG/LNG shall comply with the leakage tests mentioned in Annexes 5B
and 5C after having been submitted to 96h temperature cycle from the minimum operating temperature
up to the maximum operating temperature with a cycle time of 120min, under maximum working
pressure.
ANNEX 5I
PRESSURE CYCLE TEST APPLICABLE ONLY TO CYLINDERS (SEE ANNEX 3)
ANNEXES 5J AND 5K – NOT ALLOCATED

ANNEX 5M
BURST/DESTRUCTIVE TEST APPLICABLE ONLY TO CNG CYLINDERS (SEE ANNEX 3A)
ANNEX 5N
VIBRATION RESISTANCE TEST
1. All components with moving parts shall remain undamaged, continue to operate, and comply
with the component's leakage tests after 6h of vibration in accordance with the following test
method.
2. TEST METHOD
2.1. The component shall be secured in an apparatus and vibrated for 2h at 17Hz with an amplitude
of 1.5mm (0.06in) in each of three orientation axes. On completion of 6h of vibration the
component shall comply with Annex 5C.

ANNEX 5P
LNG – LOW TEMPERATURE TEST
1. The component shall be operated through 96% of the total cycles (given in the Annex 4 of the
product) at less -162°C temperature and working pressure.
2. The component shall be operated through 4% of the total cycles at the appropriate maximum
temperature (specified in Annex 5O) and working pressure and shall comply with Annexes 5B
and 5C at the completion of the temperature cycles.
3. This test may be interrupted, if desired, at 20% intervals for leakage testing.
4. Following cycling testing, perform the hydrostatic test.

ANNEX 6
PROVISIONS ON CNG IDENTIFICATION MARK FOR VEHICLES OFF CATERGORIES M AND M , N
AND N
(Paragraph 18.1.8.1. of this Regulation)
The sign consists of a sticker which shall be weather resistant.
The colour and dimensions of the sticker shall fulfil the following requirements:
Colours:
Background:
Border:
Letters:
Dimensions
Border width:
Character height:
Character thickness:
Sticker width:
Sticker height:
green
white or white reflecting
white or white reflecting
4 - 6mm
≥25mm
≥4mm
110 - 150mm
80 - 110mmm
The word "CNG" shalll be centred in the middlee of the sticker.

Compressed Natural Gas (CNG) and/or Liquefied Natural Gas (LNG) Vehicles.